Limonite - 220, 266, 271, 230, 124, 180, 296, 311, 338, 347, 363, 542, 491, 190, 380, 440, 329, 193, 222, 172, 446, 38, 105, 181, 209, 576, 337, 502, 400, 159, 9, 15, 57, 86, 95, 99, 104, 116, 120, 146, 166, 171, 201, 202, 224, 236, 251, 270, 282, 292, 298, 303, 306, 334, 340, 346, 354, 362, 378, 385, 388, 395, 412, 429, 430, 431, 447, 462, 470, 557, 562, 567, 591, 593, 594, 603, 606, 612, 636, 650, 663, 664, 667

Linnaeite - 421, 363, 542

Lizardite - 271, 124

Mackinawite - 266

Magnesiochromite - 167, 314

Magnesite - 314, 271, 124, 96, 87, 159

Magnetite - 421, 271, 61, 84, 124, 179, 180, 582, 311, 350, 363, 471, 542, 27, 53, 469, 502, 159, 132, 123, 210, 345, 512

Malachite - 266, 271, 137, 311, 338, 350, 363, 371, 542, 491, 380, 27, 193, 172

'Manganese Dendrites' - 271

'Manganoan Calcite' - 350, 172

'Marble' - 183, 23, 83, 265

Marcasite - 315, 235, 440

Margarite - 314, 230

Maucherite - 314

Mcguinnessite - 271

Melanterite - 27, 79

'Mica Group' - 87

Microcline - 284, 230, 296, 190, 27, 329, 222, 38, 370, 337, 420

Microlite - 296

'Milky Quartz' - 183

Millerite - 314, 271, 191

Molybdenite - 271, 284, 230, 255, 494

'Moss Agate' - 28, 124, 23, 239, 125, 22, 178

'Mountain Leather' - 230

Muscovite - 266, 582, 296, 347, 515, 190, 380, 329, 38, 337, 420

Nimite - 271

Nontronite - 109

'Ochre' - 8, 457

'Olivine' - 271, 162

Omphacite - 271

Opal - 271, 124

'Opal-AN' - 457

Orthoclase - 296, 190, 380

Ottrélite - 137

Palladium - 271

Pargasite - 271

Pentlandite - 271

'Petrified Wood' - 315, 457

Phlogopite - 266, 230, 347, 190, 329, 222, 103

Platinum - 271, 338

Pokrovskite - 271

Prehnite - 271

Pseudomalachite - 363

Pyrite - 266, 314, 271, 284, 230, 179, 180, 191, 311, 338, 347, 363, 371, 542, 239, 245, 190, 380, 27, 79, 329, 222, 162, 337, 659, 502, 400, 457

Pyroaurite - 314

Pyrochlore - 296

Pyrolusite - 183, 452, 367

Pyrope - 190

Pyrophyllite - 337

Pyrrhotite - 266, 271, 230, 338, 347, 357, 190, 329, 222

Quartz - 314, 271, 230, 84, 124, 268, 582, 296, 311, 338, 363, 371, 542, 239, 491, 190, 380, 27, 87, 329, 222, 172, 38, 162, 370, 576, 420, 400, 441, 457, 43, 272, 326, 504

'Remingtonite' - 421

Riebeckite - 542

'Rock Crystal' - 183, 105

Rockbridgeite - 220

Rosasite - 172

'Rutilated Quartz' - 105

Rutile - 266, 271, 124, 347, 329, 222, 597, 132, 113

'Scapolite' - 266

Schorl - 268, 296, 347, 515, 27, 329, 222, 38, 331, 426, 337, 400

'Selenite' - 27

'Sericite' - 38

'Serpentine Group' - 314, 230, 363, 367, 639, 239, 641, 336

Siderite - 284, 244, 191, 363, 542, 235, 159, 146, 171, 236, 282, 557, 567, 602

Siegenite - 363

Sillimanite - 85

Silver - 183, 380

Smithsonite - 83, 172

'Smoky Quartz' - 230, 239, 100, 105, 441

'Specularite' - 542, 380, 193, 172, 337

Spessartine - 296, 38, 596, 71

Sphalerite - 421, 230, 338, 350, 363, 371, 172

Spinel - 363

Staurolite - 239, 576, 400

Stibnite - 124, 183

'Stilbite' - 284, 357, 27, 162

Strontianite - 380

Sulphur - 371

Talc - 266, 314, 271, 51, 230, 84, 363, 435, 542, 239, 27, 53, 329, 222, 103, 556, 159, 144, 240

Tantalite - 38

Tenorite - 311

Tetradymite - 367

Tetrahedrite - 311

'Thulite' - 271

Titanite - 271, 284, 230, 190, 380, 222, 659, 502

Tochilinite - 271

Todorokite - 350

'Tourmaline' - 271, 23, 239, 380

Tremolite - 266, 271, 35, 230, 347, 83, 27, 53, 329, 222, 103

Uvite - 347

Vermiculite - 103

Vesuvianite - 271, 190

Violarite - 363

Vivianite - 221, 637

Wernerite - 230, 222

Xonotlite - 271

Zaratite - 314, 87

Zinnwaldite - 296

Zircon - 596, 113

Zoisite - 271, 357, 83

201 minerals listed.

Locality Key

1	Albert Sandusky Quarries, Howard Co., Maryland, USA
2	Alberton Quarry, Baltimore Co., Maryland, USA
3	Allan Ore Banks, Prince Georges Co., Maryland, USA
4	Allegany Co., Maryland, USA
5	Allegany, Allegany Co., Maryland, USA
6	Anderson Mine, Maryland, USA
7	Anderson Ore Bank, Anne Arundel Co., Maryland, USA
8	Anne Arundel Co., Maryland, USA
9	Appletown Ore Bank, Washington Co., Maryland, USA
10	Arlington No. 1 Quarry, Howard Co., Maryland, USA
11	Arlington No. 2 Quarry, Howard Co., Maryland, USA
12	Arundel quarry, Baltimore, Baltimore Co., Maryland, USA
13	Ashland Ore Bank, Prince Georges Co., Maryland, USA
14	August Sandusky Quarry, Baltimore Co., Maryland, USA
15	Avondale Ore Banks, Carroll Co., Maryland, USA
16	Ayres Mine, Harford Co., Maryland, USA
17	Ayres Ore Bank, Harford Co., Maryland, USA
18	B Giancola Quarry, Montgomery Co., Maryland, USA
19	B.F. Shriver Quarry, Avondale, Carroll Co., Maryland, USA
20	Back Catoctin Furnace Ore Banks, Frederick Co., Maryland, USA
21	Bald Friar Quarry (Deland Mining and Milling Company), Cecil Co., Maryland, USA
22	Bald Friar, Cecil Co., Maryland, USA
23	Baltimore Co., Maryland, USA
24	Baltimore Feldspar Company Quarries (1), Howard Co., Maryland, USA
25	Baltimore Feldspar Company Quarry (2), Howard Co., Maryland, USA
26	Baltimore, Baltimore Co., Maryland, USA
27	Bare Hills Copper Mine (Smith Avenue Copper Mine), Bare Hills, Baltimore Co., Maryland, USA
28	Bare Hills, Baltimore, Baltimore Co., Maryland, USA
29	Barren Creek Deposits (Baron Creek Deposits), Wicomico Co., Maryland, USA
30	Barrick Quarry, LeGore, Frederick Co., Maryland, USA
31	Barton Deposit, Washington Co., Maryland, USA
32	Baugh and Sons Company Quarry, Howard Co., Maryland, USA
33	Beasman Prospect, Carroll Co., Maryland, USA
34	Beaver Creek Pit (H. B. Mellott Estate; Inc.), Washington Co., Maryland, USA
35	Beaver Dam Quarry (Baker and Connelly Quarry), Cockeysville, Baltimore Co., Maryland, USA
36	Beechwood Mine, Deal, Garrett Co., Maryland, USA
37	Belt Deposit, Frederick Co., Maryland, USA
38	Ben Murphy Mica Mine, Scaggsville, Howard Co., Maryland, USA
39	Bennett Ore Bank, Anne Arundel Co., Maryland, USA
40	Benser Ore Bank, Harford Co., Maryland, USA
41	Benson Ore Bank, Anne Arundel Co., Maryland, USA
42	Berkley Ore Bank, Anne Arundel Co., Maryland, USA
43	Bethesda Mine (Miller Mine), Montgomery Co., Maryland, USA
44	Bethesda, Montgomery Co., Maryland, USA
45	Bethke Ore Bank, Baltimore Co., Maryland, USA
46	Biddison Pegmatite Deposit, Howard Co., Maryland, USA
47	Birdseye Mine (Birdseye Pit), Harford Co., Maryland, USA
48	Bishop Ore Bank, Baltimore Co., Maryland, USA
49	Black Hills Gold Mine, Boyds, Montgomery Co., Maryland, USA
50	Blowhorn Ore Banks, Baltimore Co., Maryland, USA
51	Blue Mount Quarry, Blue Mount, Baltimore Co., Maryland, USA
52	Bogley Mine, Rockville, Montgomery Co., Maryland, USA
53	Bok Asbestos Mine, Hollofield, Baltimore Co., Maryland, USA
54	Bonaparte Quarry, Baltimore Co., Maryland, USA
55	Boonsboro Ore Bank, Washington Co., Maryland, USA
56	Boonsboro Quarry (Martin Marietta Aggregates; SE Div.), Washington Co., Maryland, USA
57	Bosley and Ensor Ore Banks, Baltimore Co., Maryland, USA
58	Bowie Operating Corporation Clay Pit, Prince Georges Co., Maryland, USA
59	Brian Ore Banks, Baltimore Co., Maryland, USA
60	Brighton Dam Road Quarry, Howard Co., Maryland, USA
61	Broad Creek Mine, Whiteford, Harford Co., Maryland, USA
62	Brooks Ore Bank, Howard Co., Maryland, USA
63	Brookville Mine, Montgomery Co., Maryland, USA
64	Brown and King Ore Banks, Anne Arundel Co., Maryland, USA
65	Brown Ore Banks, Baltimore Co., Maryland, USA
66	Brown Ore Banks, Howard Co., Maryland, USA
67	Brown Quarries, Howard Co., Maryland, USA
68	Browns Farm Placer (Cox Chromite Placer), Cecil Co., Maryland, USA
69	Buck Ore Bank, Prince Georges Co., Maryland, USA
70	Burrough's Quarry, Texas, Baltimore Co., Maryland, USA
71	Burtonsville, Montgomery Co., Maryland, USA
72	Caldwell Quarries (Caldwell Quarry), Cecil Co., Maryland, USA
73	Caldwell Quarry Original (Caldwell Quarry), Cecil Co., Maryland, USA
74	Calhoun Mine, Delight, Baltimore Co., Maryland, USA
75	California Ore Banks, Prince Georges Co., Maryland, USA
76	Calvert Co., Maryland, USA
77	Cambria Quarry (Whiteford Quarry), Harford Co., Maryland, USA
78	Cambria, Baltimore Co., Maryland, USA
79	Cape Sable, Magothy River, Arnold, Anne Arundel Co., Maryland, USA
80	Capitol Clay Products Company (West Brothers Brick Company), Prince Georges Co., Maryland, USA
81	Cardiff, Harford Co., Maryland, USA
82	Caroline Co., Maryland, USA
83	Carroll Co., Maryland, USA
84	Carroll Mine, Sykesville, Carroll Co., Maryland, USA
85	Carrolls Mill, Howard Co., Maryland, USA
86	Catoctin/Catoctin Furance Banks, Frederick Co., Maryland, USA
87	Cecil Co., Maryland, USA
88	Cedar Run Prospect (Run East of Rock Springs), Cecil Co., Maryland, USA
89	Charles Ore Bank, Washington Co., Maryland, USA
90	Cherry Hill Chrome Sand Placer (Yinger Farm Prospect; Road Pit), Harford Co., Maryland, USA
91	Cherry Hill Mine, Harford Co., Maryland, USA
92	Cherry Hill Ore Banks, Harford Co., Maryland, USA
93	Chestertown Pit (Chestertown Brick Company Inc.), Kent Co., Maryland, USA
94	Chestnut Hill Ore Banks, Carroll Co., Maryland, USA
95	Chew Ore Bank, Baltimore Co., Maryland, USA
96	Choate Mine, Owings Mills, Baltimore Co., Maryland, USA
97	Christie Road Ore Deposit, Allegany Co., Maryland, USA
98	Churchville Quarry (Davis Quarry Company Inc.), Harford Co., Maryland, USA
99	Clarey Ore Bank, Frederick Co., Maryland, USA
100	Clarksville, Howard Co., Maryland, USA
101	Clay Mine-Victor Cushwa (Victor Cushwa and Sons Inc.), Washington Co., Maryland, USA
102	Cochran Prospect, Baltimore Co., Maryland, USA
103	Cockeysville Marble occurrence, Marriottsville, Howard Co., Maryland, USA
104	Coddington Deposit, Garrett Co., Maryland, USA
105	Columbia area, Howard Co., Maryland, USA
106	Congressional Golf Course, Bethesda, Montgomery Co., Maryland, USA
107	Conowingo Marble and Mineral Quarry, Cecil Co., Maryland, USA
108	Cook Ore Banks, Baltimore Co., Maryland, USA
109	Cooper Run, Ellicott City, Howard Co., Maryland, USA
110	Copps Branch Bank, Carroll Co., Maryland, USA
111	Cordy Quarry, Howard Co., Maryland, USA
112	Coursey Ore Bank, Baltimore Co., Maryland, USA
113	Cove Point Placer, Calvert Co., Maryland, USA
114	Cox Mines (Mountain View Mine; Repp Mine), Frederick Co., Maryland, USA
115	Crook Ore Bank, Anne Arundel Co., Maryland, USA
116	Cross Ore Bank, Baltimore Co., Maryland, USA
117	Crow Ore Bank, Harford Co., Maryland, USA
118	Cumberland Cement & Supply Quarry (Rock Cut Plant & Quarry; Sand Plant No. 3), Allegany Co., Maryland, USA
119	Dargan Mine, Washington Co., Maryland, USA
120	Dave Thomas Ore Bank, Frederick Co., Maryland, USA
121	Dawson Quarry, Cecil Co., Maryland, USA
122	Deep Creek Mine, Garrett Co., Maryland, USA
123	Deer Creek Mine, Harford Co., Maryland, USA
124	Delight Quarry (Soldier's Delight Quarry; Dyer Quarry), Soldiers' Delight ridge, Delight, Baltimore Co., Maryland, USA
125	Delight, Baltimore Co., Maryland, USA
126	Deposit N. of Cumberland, Allegany Co., Maryland, USA
127	Deposit W. of Cumberland/Gephart/Narrows Park/Long Deposits, Allegany Co., Maryland, USA
128	Devries Quarry No. 1, Carroll Co., Maryland, USA
129	Devries Quarry No. 2, Carroll Co., Maryland, USA
130	Devries Quarry No. 3, Carroll Co., Maryland, USA
131	Dietz Quarry, Baltimore Co., Maryland, USA
132	Dinning Rutile Prospect, Harford Co., Maryland, USA
133	Discovery Workings (Main Workings), Bare Hills, Baltimore Co., Maryland, USA
134	Disney Ore Bank, Anne Arundel Co., Maryland, USA
135	Dolfield Placer (Rose Placer), Baltimore Co., Maryland, USA
136	Dolly Hyde Mines, Carroll Co., Maryland, USA
137	Dolyhyde Mine (Dolly Hyde Mine), Libertytown, Frederick Co., Maryland, USA
138	Donaldson Ore Banks, Prince Georges Co., Maryland, USA
139	Dorchester Co., Maryland, USA
140	Dorsey Ore Banks, Anne Arundel Co., Maryland, USA
141	Dorseys Quarry No. 2, Howard Co., Maryland, USA
142	Dorseys Run Quarry No. 1, Howard Co., Maryland, USA
143	Dower House Road Plant, Prince Georges Co., Maryland, USA
144	Dublin Quarries (Maryland Ceramic & Steatite Company Inc), Harford Co., Maryland, USA
145	During Ore Bank, Baltimore Co., Maryland, USA
146	Dutch Hollow/Ridgeley Deposits, Allegany Co., Maryland, USA
147	Duvall Ore Banks, Prince Georges Co., Maryland, USA
148	Eagle Mine, Bethesda, Montgomery Co., Maryland, USA
149	Earth Products Company Mines, Montgomery Co., Maryland, USA
150	Earth Products Company Quarries, Montgomery Co., Maryland, USA
151	East Baltimore Ore Banks, Baltimore Co., Maryland, USA
152	East Friendsville Deposit, Garrett Co., Maryland, USA
153	East Lonaconing Deposit, Allegany Co., Maryland, USA
154	East Lutherville Ore Bank, Baltimore Co., Maryland, USA
155	East Marriottsville Quarry, Howard Co., Maryland, USA
156	Easton Clay Pit, Talbot Co., Maryland, USA
157	Eckhart, Allegany Co., Maryland, USA
158	Ed. Friend Deposit, Garrett Co., Maryland, USA
159	Ednor Steatite Locality, Ednor, Montgomery Co., Maryland, USA
160	Eiler Prospect, Frederick Co., Maryland, USA
161	Elk Mills Quarry (D. M. Stoltzfus and Sons; Inc.), Cecil Co., Maryland, USA
162	Ellicott City, Howard Co., Maryland, USA
163	Ellicott Gold Mine (Sandy Spring Mine; Brookeville Mine), Montgomery Co., Maryland, USA
164	Ellicott Ore Bank, Anne Arundel Co., Maryland, USA
165	Ender Ore Bank, Baltimore Co., Maryland, USA
166	Ensor Bank, Frederick Co., Maryland, USA
167	Etchison mine & Lyde Griffith Property, Montgomery Co., Maryland, USA
168	Evergreen Point Quarry (Frederick Quarry; H. B. Mellott Estate; Inc.), Frederick Co., Maryland, USA
169	Excelsior Brick and Pottery Company Bank, Baltimore Co., Maryland, USA
170	Fagan Quarries, Howard Co., Maryland, USA
171	Falkner Deposit, Garrett Co., Maryland, USA
172	Farmers Cooperative Limestone Quarry, New London, Frederick Co., Maryland, USA
173	Feazer Quarry, Howard Co., Maryland, USA
174	Federalsburg Mine, Caroline Co., Maryland, USA
175	Feeney and Atherton Company Quarries, Baltimore Co., Maryland, USA
176	Fisher and Carozza Quarries, Howard Co., Maryland, USA
177	Flattermash Ore Bank, Harford Co., Maryland, USA
178	Flintville, Harford Co., Maryland, USA
179	Florence Mine, Sykesville, Carroll Co., Maryland, USA
180	Ford Mine, Bethesda, Montgomery Co., Maryland, USA
181	Forsythe Mine, Cooksville, Howard Co., Maryland, USA
182	Franklin, Allegany Co., Maryland, USA
183	Frederick Co., Maryland, USA
184	Frederick Gold Mine (Clifton Gold Mine), Frederick Co., Maryland, USA
185	Frederick Quarry, Frederick Co., Maryland, USA
186	French Quarry, Baltimore Co., Maryland, USA
187	Friel Ore Bank, Prince Georges Co., Maryland, USA
188	Friendsville Furnace Deposit, Garrett Co., Maryland, USA
189	Frost Company Deposit, Allegany Co., Maryland, USA
190	Frost Quarry, Davis, Howard Co., Maryland, USA
191	Frostburg, Allegany Co., Maryland, USA
192	Fry Quarry (Vetter Brothers; Inc.), Charles Co., Maryland, USA
193	Gaithersburg, Montgomery Co., Maryland, USA
194	Garey Ore Bank, Anne Arundel Co., Maryland, USA
195	Garrett Co., Maryland, USA
196	Garrett County Highway Pit, Garrett Co., Maryland, USA
197	Garrett County Limestone Quarry (Keystone Lime Company), Garrett Co., Maryland, USA
198	Gary Quarry, Howard Co., Maryland, USA
199	Gatch Quarry (Gatch Crushed Stone Company Inc.), Harford Co., Maryland, USA
200	Gay Shore Prospect, Baltimore Co., Maryland, USA
201	Geeting Ore Bank, Washington Co., Maryland, USA
202	Geist Ore Bank, Baltimore Co., Maryland, USA
203	George Iager Beryl-Mica Prospects, Scaggsville, Howard Co., Maryland, USA
204	Gephart Deposit, Allegany Co., Maryland, USA
205	German Ore Bank, Anne Arundel Co., Maryland, USA
206	Gerst Ore Bank, Baltimore Co., Maryland, USA
207	Gilmor Quarry, Baltimore Co., Maryland, USA
208	Gilmore Mine (B. H. Warner Mine), Montgomery Co., Maryland, USA
209	Glenelg, Howard Co., Maryland, USA
210	Glyndon Occurrence, Baltimore Co., Maryland, USA
211	Goldwine Ore Bank, Anne Arundel Co., Maryland, USA
212	Gore Placer, Baltimore Co., Maryland, USA
213	Gorsuch Point Mine, Baltimore Co., Maryland, USA
214	Gosweiler Ore Bank, Anne Arundel Co., Maryland, USA
215	Granite (Waltersville), Baltimore Co., Maryland, USA
216	Grays Run Quarry (D. M. Stoltzfus and Sons Inc.), Harford Co., Maryland, USA
217	Green Ore Banks, Prince Georges Co., Maryland, USA
218	Green Spring Ore Bank, Washington Co., Maryland, USA
219	Green Valley Road Quarry (Lehigh Portland Cement Company), Frederick Co., Maryland, USA
220	Greenbelt, Prince Georges Co., Maryland, USA
221	Greenbury Point, Anne Arundel Co., Maryland, USA
222	Greensburg Quarry (McMahon Quarry), Valley Stream, Baltimore Co., Maryland, USA
223	Griffith Mine, Montgomery Co., Maryland, USA
224	Grim Ore Bank, Frederick Co., Maryland, USA
225	Gudelsky Farm Prospect, Howard Co., Maryland, USA
226	Guepl Deposit, Allegany Co., Maryland, USA
227	Guilford & Waltersville Quarry, Baltimore Co., Maryland, USA
228	Gwynn Quarry, Baltimore Co., Maryland, USA
229	H. Clay Whiteford and Company Quarry, Harford Co., Maryland, USA
230	H.T. Campbell Quarry (Campbell Quarry), Texas, Baltimore Co., Maryland, USA
231	Haker Ore Bank, Prince Georges Co., Maryland, USA
232	Hamilton Quarries, Baltimore Co., Maryland, USA
233	Hammond Prospect (Pittinger Prospect), Frederick Co., Maryland, USA
234	Hanna Quarry, Howard Co., Maryland, USA
235	Hanover, Anne Arundel Co., Maryland, USA
236	Hansel Deposit, Garrett Co., Maryland, USA
237	Hanway Ore Bank, Harford Co., Maryland, USA
238	Harbison-Walker Refactories, Garrett Co., Maryland, USA
239	Harford Co., Maryland, USA
240	Harford Talc Company Quarry, Harford Co., Maryland, USA
241	Harmon Ore Bank, Anne Arundel Co., Maryland, USA
242	Harold Stromberg Quarry, Howard Co., Maryland, USA
243	Harris Mine, Baltimore Co., Maryland, USA
244	Harris' Quarry, Baltimore, Baltimore Co., Maryland, USA
245	Harrison Mine (Potomac), Bethesda, Montgomery Co., Maryland, USA
246	Haslup Ore Bank, Howard Co., Maryland, USA
247	Havre De Grace Quarry, Harford Co., Maryland, USA
248	Hedgman Ore Banks Prospect, Prince Georges Co., Maryland, USA
249	Hengemihle Ore Bank, Baltimore Co., Maryland, USA
250	Henryton Pegmatite Prospect, Carroll Co., Maryland, USA
251	Herman Ore Bank, Baltimore Co., Maryland, USA
252	Highe Quarry No. 1, Howard Co., Maryland, USA
253	Highe Quarry No. 2, Howard Co., Maryland, USA
254	Hile Works (Leslie Quarry), Cecil Co., Maryland, USA
255	Hilton Quarry, Baltimore Co., Maryland, USA
256	Hines Prospects, Frederick Co., Maryland, USA
257	Hobbs Ore Bank, Anne Arundel Co., Maryland, USA
258	Hobbs Ore Bank, Howard Co., Maryland, USA
259	Hofmeister Ore Bank, Baltimore Co., Maryland, USA
260	Hollins Ore Bank, Anne Arundel Co., Maryland, USA
261	Hollofield Quarries, Baltimore Co., Maryland, USA
262	Hood Ore Bank, Carroll Co., Maryland, USA
263	Hooff Ore Bank, Prince Georges Co., Maryland, USA
264	Hope Ore Bank, Harford Co., Maryland, USA
265	Howard Co., Maryland, USA
266	Howard-Montgomery quarry, Clarksville, Howard Co., Maryland, USA
267	Hoyes Quarry and Plant, Garrett Co., Maryland, USA
268	Huddlestone Mine, Bethesda, Montgomery Co., Maryland, USA
269	Humphrey Quarry, Baltimore Co., Maryland, USA
270	Hunter Ore Bank, Carroll Co., Maryland, USA
271	Hunting Hill quarry (Rockville Crushed Stone Quarry; Travilah Quarry; Rockville Quarry; Bardon Stone Quarry), Rockville, Montgomery Co., Maryland, USA
272	Irma Mine, Montgomery Co., Maryland, USA
273	Israel Creek Prospects, Frederick Co., Maryland, USA
274	J. M. Clayton Company Oystershell Deposit, Dorchester Co., Maryland, USA
275	J. M. Clayton Company Prospect, Dorchester Co., Maryland, USA
276	James Peach Quarry, Baltimore Co., Maryland, USA
277	Jenkins Mine (Todd Mine), Harford Co., Maryland, USA
278	Jenkins Ore Bank, Baltimore Co., Maryland, USA
279	John R. Harris Prospect, Cecil Co., Maryland, USA
280	John Sadilek Ore Banks, Prince Georges Co., Maryland, USA
281	John Wallen Quarry, Carroll Co., Maryland, USA
282	Johnson Field Deposit, Allegany Co., Maryland, USA
283	Johnsville Mine, Johnsville, Frederick Co., Maryland, USA
284	Jones Falls Quarries, Baltimore, Baltimore Co., Maryland, USA
285	Jones Ore Bank, Prince Georges Co., Maryland, USA
286	Jones Quarry, Baltimore Co., Maryland, USA
287	Joppa Ore Banks, Harford Co., Maryland, USA
288	Joseph Sadilek Ore Bank, Prince Georges Co., Maryland, USA
289	Kahler Ore Bank, Baltimore Co., Maryland, USA
290	Kaufman Ore Bank, Baltimore Co., Maryland, USA
291	Kaylorite Corporation Greensand Pit, Calvert Co., Maryland, USA
292	Keeny Ore Bank, Carroll Co., Maryland, USA
293	Keller Quarry, Buckeystown, Frederick Co., Maryland, USA
294	Kemp Quarries, Baltimore Co., Maryland, USA
295	Kennedy Ore Bank, Baltimore Co., Maryland, USA
296	Kensington Mica Mine, Kensington, Montgomery Co., Maryland, USA
297	Kern Ore Bank, Baltimore Co., Maryland, USA
298	Kiefer Thomas Ore Bank, Frederick Co., Maryland, USA
299	King Ore Bank, Baltimore Co., Maryland, USA
300	Kirwan Ore Bank, Prince Georges Co., Maryland, USA
301	Kline's Brickyard Ore Bank, Baltimore Co., Maryland, USA
302	Knight Farm Ore Bank, Allegany Co., Maryland, USA
303	Kohler Ore Bank, Washington Co., Maryland, USA
304	Kraft Ore Banks, Baltimore Co., Maryland, USA
305	Lafey Ore Bank, Anne Arundel Co., Maryland, USA
306	Lane Property Ore Bank, Washington Co., Maryland, USA
307	Legore Quarry, Frederick Co., Maryland, USA
308	Lehigh Pit, Carroll Co., Maryland, USA
309	Leitschuh Ore Bank, Baltimore Co., Maryland, USA
310	Lepper Ore Bank, Baltimore Co., Maryland, USA
311	Liberty Mine, Libertytown, Frederick Co., Maryland, USA
312	Lime Kiln Quarry & Plant (Alpha Portland Cement Company), Frederick Co., Maryland, USA
313	Lincoln Farm Placer, Cecil Co., Maryland, USA
314	Line pit (Lowe's Mine), State Line District, Cecil Co., Maryland, USA
315	Link pits, Baltimore Co., Maryland, USA
316	Linthicum Ore Banks, Anne Arundel Co., Maryland, USA
317	Lohman Ore Banks, Baltimore Co., Maryland, USA
318	Lomyer Ore Bank, Harford Co., Maryland, USA
319	Lonaconing Deposit, Allegany Co., Maryland, USA
320	Lonaconing Quarry, Garrett Co., Maryland, USA
321	Long Deposit, Allegany Co., Maryland, USA
322	Louis A Morgart Clay Deposit (E Coal Seam Underclay; Bolivar/Upper Freeport Clay Bed), Garrett Co., Maryland, USA
323	Love Point Dredge & Terminal, Queen Annes Co., Maryland, USA
324	Lower Tunnel Deposit, Allegany Co., Maryland, USA
325	Lutz Chromite Placer, Baltimore Co., Maryland, USA
326	Lynch Mine, Montgomery Co., Maryland, USA
327	Lyons Creek Diatomaceous Earth Deposit, Calvert Co., Maryland, USA
328	Mackall Building Stone Quarry, Calvert Co., Maryland, USA
329	Marriottsville Quarry, Hernwood, Baltimore Co., Maryland, USA
330	Marriottsville Quarry, Howard Co., Maryland, USA
331	Marriottsville Road, Marriottsville, Howard Co., Maryland, USA
332	Marriottsville, Howard Co., Maryland, USA
333	Marshall Sand Chrome Property, Cecil Co., Maryland, USA
334	Maryland Bank, Washington Co., Maryland, USA
335	Maryland Clay Products Inc., Prince Georges Co., Maryland, USA

336	Maryland Green Marble Corporation Quarry, Harford Co., Maryland, USA
337	Maryland Mica Company Mine, Simpsonville, Howard Co., Maryland, USA
338	Maryland Mine (Allen Shaft), Cropley, Montgomery Co., Maryland, USA
339	Maryland, USA
340	Mase Ore Banks, Baltimore Co., Maryland, USA
341	Mason Ore Banks, Prince Georges Co., Maryland, USA
342	Mathews Quarry, Howard Co., Maryland, USA
343	Matthews Ore Bank, Baltimore Co., Maryland, USA
344	Maus Ore Bank, Carroll Co., Maryland, USA
345	McComas Ore Banks, Baltimore Co., Maryland, USA
346	McLaughlin Ore Bank, Washington Co., Maryland, USA
347	McMahon Quarry, Bare Hills, Baltimore, Baltimore Co., Maryland, USA
348	McVey Quarry, Cecil Co., Maryland, USA
349	Mechanics Valley Quarry (Maryland Materials; Inc.), Cecil Co., Maryland, USA
350	Medford Quarry (Redland Genstar Quarry), Medford, Carroll Co., Maryland, USA
351	Melvin Quarry No. 1, Howard Co., Maryland, USA
352	Melvin Quarry No. 2, Howard Co., Maryland, USA
353	Melvin Quarry, Howard Co., Maryland, USA
354	Meyer Ore Bank, Carroll Co., Maryland, USA
355	Midlothian Field Deposit, Allegany Co., Maryland, USA
356	Milbrook Ore Bank, Prince Georges Co., Maryland, USA
357	Milford Quarry, Baltimore Co., Maryland, USA
358	Miller Deposit, Allegany Co., Maryland, USA
359	Miller Ore Bank, Carroll Co., Maryland, USA
360	Miller Ore Banks, Baltimore Co., Maryland, USA
361	Minckins Quarry, Baltimore Co., Maryland, USA
362	Minebank Ore Bank, Baltimore Co., Maryland, USA
363	Mineral Hill Mine, Louisville, Sykesville, Carroll Co., Maryland, USA
364	Mineral Ridge Property, Anne Arundel Co., Maryland, USA
365	Mohr Ore Bank, Baltimore Co., Maryland, USA
366	Monroe Prospect, Carroll Co., Maryland, USA
367	Montgomery Co., Maryland, USA
368	Montgomery Mine, Barnesville, Montgomery Co., Maryland, USA
369	Moody Quarry, Howard Co., Maryland, USA
370	Mount Saint Clement College Quarry, Ilchester, Howard Co., Maryland, USA
371	Mountain View Mine, Union Bridge, Carroll Co., Maryland, USA
372	Mountain View mine, Union Bridge, Frederick Co., Maryland, USA
373	Muirkirk Pit, Prince Georges Co., Maryland, USA
374	Myers Ore Bank, Baltimore Co., Maryland, USA
375	Narrows Park Deposit, Allegany Co., Maryland, USA
376	Neff Deposit, Allegany Co., Maryland, USA
377	Neikirk Mine, Harford Co., Maryland, USA
378	Neller Ore Bank, Carroll Co., Maryland, USA
379	New London Iron Mine, Frederick Co., Maryland, USA
380	New London Mine (Linganore Mine), New London, Frederick Co., Maryland, USA
381	New London, Frederick Co., Maryland, USA
382	New Savage Clay Works Pit, Garrett Co., Maryland, USA
383	New Windsor, Carroll Co., Maryland, USA
384	Nicholson Ore Bank, Prince Georges Co., Maryland, USA
385	Nina Thomas Ore Bank, Frederick Co., Maryland, USA
386	Nine Mile Hill Deposit, Baltimore Co., Maryland, USA
387	Nine Number 62, Baltimore Co., Maryland, USA
388	No. Name/Knight Farm Ore Bank, Allegany Co., Maryland, USA
389	Norris Ore Bank, Baltimore Co., Maryland, USA
390	North Catoctin Furnace Ore Banks, Frederick Co., Maryland, USA
391	North Cumberland Deposit, Allegany Co., Maryland, USA
392	North East Quarry, Cecil Co., Maryland, USA
393	North Ebbvale Ore Bank, Carroll Co., Maryland, USA
394	North Green Spring Furnace Ore Bank, Washington Co., Maryland, USA
395	North Mt. Area, Washington Co., Maryland, USA
396	Northeast Green Spring Furnace Bank, Washington Co., Maryland, USA
397	Northeast Halethorpe Ore Banks, Baltimore Co., Maryland, USA
398	Northeast Landsdowne Ore Banks, Baltimore Co., Maryland, USA
399	Northwest Boonsboro Ore Bank, Washington Co., Maryland, USA
400	Northwest Branch Locality, Silver Spring, Montgomery Co., Maryland, USA
401	Northwest Contee Ore Banks, Prince Georges Co., Maryland, USA
402	Northwest Landsdowne Ore Banks, Baltimore Co., Maryland, USA
403	Notch Cliff Quarries, Baltimore Co., Maryland, USA
404	O'Brien Ore Banks, Prince Georges Co., Maryland, USA
405	O'Connor Farm Quarries, Howard Co., Maryland, USA
406	Obrien Ore Banks, Baltimore Co., Maryland, USA
407	Offutt Quarry, Baltimore Co., Maryland, USA
408	Old Clay Deposit N. of Solomons Island, Calvert Co., Maryland, USA
409	Old Greensand-Diatomaceous Earth Pit, Calvert Co., Maryland, USA
410	Old Triplett Placer, Baltimore Co., Maryland, USA
411	Oregan Ridge, Baltimore Co., Maryland, USA
412	Oregon Ore Banks, Baltimore Co., Maryland, USA
413	Orr Silica Sand Property Prospect, Anne Arundel Co., Maryland, USA
414	Oursler Quarry, Carroll Co., Maryland, USA
415	Oursler Talc Quarries, Carroll Co., Maryland, USA
416	Owings Mills, Baltimore Co., Maryland, USA
417	Oxon Hill, Prince Georges Co., Maryland, USA
418	P. G. Saubles Quarry, Frederick Co., Maryland, USA
419	Paint Branch, Silver Spring, Montgomery Co., Maryland, USA
420	Parlet Prospect, Simpsonville, Howard Co., Maryland, USA
421	Patapsco mine (Patapsco Mines; Finksburg Mine; Wildesen Mine; Orchard Mine), Finksburg, Sykesville, Carroll Co., Maryland, USA
422	Patapsco Quarry (Patapsco Natural Stone Quarries Inc), Baltimore Co., Maryland, USA
423	Patapsco Quarry, Howard Co., Maryland, USA
424	Patrick Ambush Ore Bank, Frederick Co., Maryland, USA
425	Patterson Quarries, Baltimore Co., Maryland, USA
426	Patuxent River Bridge; Route 29, Scaggsville, Howard Co., Maryland, USA
427	Pearce Quarry, Baltimore Co., Maryland, USA
428	Perry Quarries, Howard Co., Maryland, USA
429	Peterman Banks, Carroll Co., Maryland, USA
430	Phoenix Dome Area - B, Harford Co., Maryland, USA
431	Phoenix Dome Area, Harford Co., Maryland, USA
432	Piccirilli Quarries (Marriotsville Quarry), Howard Co., Maryland, USA
433	Picnic Wood Quarries, Baltimore Co., Maryland, USA
434	Pierce Quarry, Baltimore Co., Maryland, USA
435	Pilot, Cecil Co., Maryland, USA
436	Pindell Quarries No. 1, Howard Co., Maryland, USA
437	Pindell Quarries No. 2, Howard Co., Maryland, USA
438	Pine Grove Farm Ore Banks (Pine Grove Ridge Ore Bank), Harford Co., Maryland, USA
439	Pine Orchard, Howard Co., Maryland, USA
440	Pinehurst, Anne Arundel Co., Maryland, USA
441	Pinesburg Quarry, Williamsport, Washington Co., Maryland, USA
442	Pitcher and Creager Brick Company Banks, Baltimore Co., Maryland, USA
443	Pitcher Ore Bank, Baltimore Co., Maryland, USA
444	Plumbmer Ore Banks, Anne Arundel Co., Maryland, USA
445	Pocono Sand Plant Quarry, Garrett Co., Maryland, USA
446	Point of Rocks Bank, Frederick Co., Maryland, USA
447	Pompey Smash Deposit, Allegany Co., Maryland, USA
448	Poole Farm Quarries, Baltimore Co., Maryland, USA
449	Poplar/White Marsh (Cyprus Mines Corp.; United Sierra; Div), Baltimore Co., Maryland, USA
450	Port Deposit Quarry (Port Deposit Granite Company), Cecil Co., Maryland, USA
451	Pot Springs Ore Banks, Baltimore Co., Maryland, USA
452	Potomac Refining Company Mine, Harpers Ferry, Washington Co., Maryland, USA
453	Powder Mill Dump, Baltimore City water tunnel, Baltimore, Baltimore Co., Maryland, USA
454	Powellsville Prospect, Wicomico Co., Maryland, USA
455	Preston Farm Pits, Cecil Co., Maryland, USA
456	Priest Deposit, Anne Arundel Co., Maryland, USA
457	Prince Georges Co., Maryland, USA
458	Product Sales Company Quarry, Howard Co., Maryland, USA
459	Prospect Hill Ore Bank, Harford Co., Maryland, USA
460	Randel Ore Bank, Anne Arundel Co., Maryland, USA
461	Randle Ore Bank, Baltimore Co., Maryland, USA
462	Reddington Ore Bank, Baltimore Co., Maryland, USA
463	Reed Mine, Harford Co., Maryland, USA
464	Reed Ore Bank, Prince Georges Co., Maryland, USA
465	Reich Ore Bank, Baltimore Co., Maryland, USA
466	Repp Mine, Frederick Co., Maryland, USA
467	Reynolds Farm Placer, Cecil Co., Maryland, USA
468	Rheinhardt Ore Bank, Baltimore Co., Maryland, USA
469	Rice Ore Bank (Rice Magnetite Mine), Howard Co., Maryland, USA
470	Rice Ore Bank, Baltimore Co., Maryland, USA
471	Richmond Mine, West Falls, Carroll Co., Maryland, USA
472	Rider Ore Bank, Baltimore Co., Maryland, USA
473	Ridgeley Deposit, Allegany Co., Maryland, USA
474	Ridgely Ore Bank, Baltimore Co., Maryland, USA
475	Riemschneider Ore Bank, Baltimore Co., Maryland, USA
476	Rieve Ore Bank, Anne Arundel Co., Maryland, USA
477	Riggs Quarry, Garrett Park, Montgomery Co., Maryland, USA
478	Riley Sand Chrome Property (Riley Quarry), Cecil Co., Maryland, USA
479	Ring Ore Bank, Baltimore Co., Maryland, USA
480	Rittenhouse Ore Bank, Baltimore Co., Maryland, USA
481	Robert D. Repp Prospect (Portland Cement Company), Carroll Co., Maryland, USA
482	Roberts Ore Bank, Prince Georges Co., Maryland, USA
483	Rock Run Gold Placers, Bethesda, Montgomery Co., Maryland, USA
484	Rockdale Quarry, Washington Co., Maryland, USA
485	Rocks Quarry (Air's Quarry), Harford Co., Maryland, USA
486	Rockville Crushed Stone Quarry, Rockville, Montgomery Co., Maryland, USA
487	Rockville, Montgomery Co., Maryland, USA
488	Rocky Ridge Pit (Baltimore Brick Company), Frederick Co., Maryland, USA
489	Roeder Ore Bank, Baltimore Co., Maryland, USA
490	Rohe Ore Bank, Baltimore Co., Maryland, USA
491	Roop Mine, New Windsor, Carroll Co., Maryland, USA
492	Rose Ore Bank, Anne Arundel Co., Maryland, USA
493	Rossville Pit (Baltimore Brick Company; Rosedale Pit), Baltimore Co., Maryland, USA
494	Ruby Quarry; Ruby Flint, Carroll Co., Maryland, USA
495	Rupp Quarries, Baltimore Co., Maryland, USA
496	Russell Quarry, Garrett Co., Maryland, USA
497	Ruth Ore Bank, Anne Arundel Co., Maryland, USA
498	S. W. Barrick & Sons Inc (Woodsboro Quarry), Frederick Co., Maryland, USA
499	Sang Run Quarry (Gaylord Fuel Corp.), Garrett Co., Maryland, USA
500	Sang Run Quarry and Mill, Garrett Co., Maryland, USA
501	Sauble Quarry, Frederick Co., Maryland, USA
502	Savage Gabbro Quarry, Savage, Howard Co., Maryland, USA
503	Savage Mountain Stone Quarry, Allegany Co., Maryland, USA
504	Sawyer Mine, Montgomery Co., Maryland, USA
505	Scaggsville, Howard Co., Maryland, USA
506	Scarff Ore Bank, Harford Co., Maryland, USA
507	Schaeffer Ore Banks, Carroll Co., Maryland, USA
508	Schmidtman Ore Bank, Baltimore Co., Maryland, USA
509	Schofield Sand Chrome Deposit (Schofield Placer), Cecil Co., Maryland, USA
510	Security Quarry & Cement Plant (Hagerstown Quarry; Marquette Cement Manufacturing Company), Washington Co., Maryland, USA
511	Sewell Ore Bank, Harford Co., Maryland, USA
512	Shawsville Area, Harford Co., Maryland, USA
513	Shipley Ore Bank, Harford Co., Maryland, USA
514	Shipley Quarry, Howard Co., Maryland, USA
515	Shoemaker Quarries, Green Springs Valley, Baltimore Co., Maryland, USA
516	Shriver Ore Bank, Prince Georges Co., Maryland, USA
517	Simpsonville, Howard Co., Maryland, USA
518	Skaggs Ore Bank, Prince Georges Co., Maryland, USA
519	Skillman Ore Banks, Harford Co., Maryland, USA
520	Skully Ore Bank, Anne Arundel Co., Maryland, USA
521	Smith Ore Bank, Anne Arundel Co., Maryland, USA
522	Smith Ore Bank, Baltimore Co., Maryland, USA
523	Smithville Bank, Caroline Co., Maryland, USA
524	Snow Hill Mine, Baltimore (City) Co., Maryland, USA
525	Solomon Ore Bank, Baltimore Co., Maryland, USA
526	Soper Hall Ore Bank, Anne Arundel Co., Maryland, USA
527	South Furnace Ore Bank, Frederick Co., Maryland, USA
528	South Granite Quarries, Baltimore Co., Maryland, USA
529	South Marriottsville Quarry, Howard Co., Maryland, USA
530	South Mine & Mill, Baltimore Co., Maryland, USA
531	South Mountain Prospect (MRDS - 10170037), Washington Co., Maryland, USA
532	South Mountain Prospect (MRDS - 10243142), Washington Co., Maryland, USA
533	South Mountain Prospect (MRDS - 10243275), Washington Co., Maryland, USA
534	South Mountain Prospect (MRDS - 10291371), Washington Co., Maryland, USA
535	South Mountain Prospect, Frederick Co., Maryland, USA
536	Southeast Indian Springs Ore Bank, Washington Co., Maryland, USA
537	Southeast Landsdowne Ore Banks, Baltimore Co., Maryland, USA
538	Southwest Catoctin Furnace Ore Bank, Frederick Co., Maryland, USA
539	Southwest Koontz Deposit, Allegany Co., Maryland, USA
540	Southwest Rock Springs Pits (Prospects Near Rock Springs), Cecil Co., Maryland, USA
541	Springfield (Mr. Tysons Mine; Sykesville Mine), Carroll Co., Maryland, USA
542	Springfield Mine, Sykesville, Carroll Co., Maryland, USA
543	Stapleton Ore Banks, Baltimore Co., Maryland, USA
544	Stevenson Farm Placer, Cecil Co., Maryland, USA
545	Stoneyhurst Quarry Number 1, Montgomery Co., Maryland, USA
546	Stoneyhurst Quarry Number 3, Montgomery Co., Maryland, USA
547	Stonyhurst Quarries, Montgomery Co., Maryland, USA
548	Streker Quarry, Howard Co., Maryland, USA
549	Stubbs Sand-Chrome Property, Cecil Co., Maryland, USA
550	Superior Sand Company Quarry (General Paving Company), Garrett Co., Maryland, USA
551	Swampoodle Ore Banks, Prince Georges Co., Maryland, USA
552	Swanton Quarry (Maryland Silica Sand Company), Garrett Co., Maryland, USA
553	Sydicum Ore Bank, Anne Arundel Co., Maryland, USA
554	Sykesville, Carroll Co., Maryland, USA
555	Talbott Ore Bank, Howard Co., Maryland, USA
556	Talc occurrence, Marriottsville, Howard Co., Maryland, USA
557	Taylor Friend Deposit, Garrett Co., Maryland, USA
558	Taylor Ore Bank, Baltimore Co., Maryland, USA
559	Taylor Quarry, Cecil Co., Maryland, USA
560	Texas Maryland Quarry Number 2, Baltimore Co., Maryland, USA
561	Texas, Baltimore Co., Maryland, USA
562	The Caves Ore Banks, Baltimore Co., Maryland, USA
563	Theis Quarry No. 1, Howard Co., Maryland, USA
564	Theis Quarry No. 2, Howard Co., Maryland, USA
565	Theis Quarry No. 3, Howard Co., Maryland, USA
566	Ties Ore Bank, Anne Arundel Co., Maryland, USA
567	Tilly Field Deposit, Garrett Co., Maryland, USA
568	Timber Neck Ore Banks, Anne Arundel Co., Maryland, USA
569	Toboll Ore Bank, Baltimore Co., Maryland, USA
570	Tolley Ore Bank, Harford Co., Maryland, USA
571	Toms Run Quarry, Montgomery Co., Maryland, USA
572	Townsend Ore Bank, Baltimore Co., Maryland, USA
573	Tremper Ore Banks, Baltimore Co., Maryland, USA
574	Tri-State Stone Company Quarry (Bethesda Quarry; Tri-State Stone Company; Inc.), Montgomery Co., Maryland, USA
575	Triplett Placer, Baltimore Co., Maryland, USA
576	Tunnel Feldspar Mine area ?, Marriottsville, Howard Co., Maryland, USA
577	Turner Ore Banks, Baltimore Co., Maryland, USA
578	Tweed Property (Tweed Placer), Cecil Co., Maryland, USA
579	Tyson Ore Bank, Anne Arundel Co., Maryland, USA
580	Tyson Ore Banks, Prince Georges Co., Maryland, USA
581	U. F. Peach Quarries, Baltimore Co., Maryland, USA
582	U.S 40 Roadcut, Catoctin Mt, Myersville, Frederick Co., Maryland, USA
583	Union 1 Mine, Allegany, Allegany Co., Maryland, USA
584	Union 2 Mine, Allegany, Allegany Co., Maryland, USA
585	Union Bridge Quarry & Cement Plant (Lehigh Portland Cement Company; Union Bridge Shale Pit), Carroll Co., Maryland, USA
586	Union Mine, Frostburg, Allegany Co., Maryland, USA
587	Unionville Mine, Frederick Co., Maryland, USA
588	Unionville, Carroll Co., Maryland, USA
589	Unnamed Clay Pit (MRDS - 10067888), Anne Arundel Co., Maryland, USA
590	Unnamed Copper Mine, Montgomery Co., Maryland, USA
591	Unnamed Deposit East of Lonaconing, Allegany Co., Maryland, USA
592	Unnamed Gravel Pits (MRDS - 10169731), Garrett Co., Maryland, USA
593	Unnamed Iron (MRDS - 10083888), Frederick Co., Maryland, USA
594	Unnamed prospect (MRDS - 10083901), Boonsboro, Washington Co., Maryland, USA
595	Unnamed prospect Near Brookville (MRDS - 10100512), Montgomery Co., Maryland, USA
596	Unnamed Quarry, Atholton, Howard Co., Maryland, USA
597	Unnamed Quarry, Daniels (Alberton), Howard Co., Maryland, USA
598	Unnamed Sandstone Quarry (MRDS - 10067998), Collington, Prince Georges Co., Maryland, USA
599	Unnamed Schist Quarry Near Cabin John Park (MRDS - 10068002), Montgomery Co., Maryland, USA
600	Unnamed Water - Free - Aluminum - Silica - Iron - Chromium - Calcium - Magnesite - Titanium Mine (MRDS - 10169984), Baltimore Co., Maryland, USA
601	Upper Potomac Mine, Hubbard, Garrett Co., Maryland, USA
602	Upper Tunnel Deposit, Allegany Co., Maryland, USA
603	Valentine Ore Bank, Allegany Co., Maryland, USA
604	Victor Cushwa and Sons Pit, Washington Co., Maryland, USA
605	Virginia Ore Banks, Baltimore Co., Maryland, USA
606	Von Kapff Ore Bank, Baltimore Co., Maryland, USA
607	Waco Mine, Clarysville, Allegany Co., Maryland, USA
608	Wagonfere Ore Bank, Baltimore Co., Maryland, USA
609	Walsh Ore Bank, Harford Co., Maryland, USA
610	Waltersville Quarry (Branch Quarry), Granite (Waltersville), Baltimore Co., Maryland, USA
611	Waranch Prospect (Patapsco State Park Prospect), Baltimore Co., Maryland, USA
612	Wareheim Deposit, Carroll Co., Maryland, USA
613	Warfield Quarry, Howard Co., Maryland, USA
614	Washington Co., Maryland, USA
615	Washington Junction Ore Banks, Frederick Co., Maryland, USA
616	Washington No. 1 Mine, Eckhart, Allegany Co., Maryland, USA
617	Washington No. 2 Mine, Eckhart, Allegany Co., Maryland, USA
618	Washington No. 3 Mine, Franklin, Allegany Co., Maryland, USA
619	Washington No. 4 Mine, Franklin, Allegany Co., Maryland, USA
620	Washington No. 5 Mine, Franklin, Allegany Co., Maryland, USA
621	Waters Ore Bank, Anne Arundel Co., Maryland, USA
622	Watson Mine, Montgomery Co., Maryland, USA
623	Weaver Stone Company Quarry (Butler Quarry; C. E. Weaver Stone Company), Baltimore Co., Maryland, USA
624	Webb's Mine, Cumberland, Allegany Co., Maryland, USA
625	Weber's Quarry, Ellicott City, Howard Co., Maryland, USA
626	Weetenkamp Quarry (Tunnel Mine), Carroll Co., Maryland, USA
627	Weir Mine, Holbrook, Baltimore Co., Maryland, USA
628	Welch Ore Bank, Anne Arundel Co., Maryland, USA
629	Weller's Quarry, Granite (Waltersville), Baltimore Co., Maryland, USA
630	Welzenbach Ore Bank, Harford Co., Maryland, USA
631	West Cumberland Deposit, Allegany Co., Maryland, USA
632	West Placer Area (Preston Placer; Sweigarts Run; Swaggarts Run; West Placer; Thornbottom Run), Cecil Co., Maryland, USA
633	Westerman Ore Bank, Baltimore Co., Maryland, USA
634	Westport Paving Brick Company Bank, Baltimore Co., Maryland, USA
635	Wharton Quarry, Howard Co., Maryland, USA
636	Wheatstone Ore Bank, Washington Co., Maryland, USA
637	Wheeler Road, Oxon Hill, Prince Georges Co., Maryland, USA
638	Whitaker Ore Banks, Baltimore Co., Maryland, USA
639	Whiteford Quarry, Cambria, Baltimore Co., Maryland, USA
640	Whitmeyer-Bridges Quarry, Hancock, Washington Co., Maryland, USA
641	Wiant's Quarry, Pilot, Cecil Co., Maryland, USA
642	Wicomico Co., Maryland, USA
643	Wilkins Mine (Wilkens Mine; John W. Carman Property), Harford Co., Maryland, USA
644	William Carbaugh's Quarry, New Windsor, Carroll Co., Maryland, USA
645	William E. Williams & Company Quarry, Cardiff, Harford Co., Maryland, USA
646	William Speigel & Son Quarry, Baltimore Co., Maryland, USA
647	William T. McKennar & Company Quarry, Baltimore, Baltimore Co., Maryland, USA
648	Williamsburg Mine, Dorchester Co., Maryland, USA
649	Willick Ore Bank, Harford Co., Maryland, USA
650	Wilson Bank, Baltimore Co., Maryland, USA
651	Wilson Farm Ore Bank, Washington Co., Maryland, USA
652	Wilson Molding Sand Pit, Anne Arundel Co., Maryland, USA
653	Wilt Quarry, Baltimore Co., Maryland, USA
654	Windsor Farm Ore Bank, Baltimore Co., Maryland, USA
655	Wolfe Quarry, Union Bridge, Frederick Co., Maryland, USA
656	Woodberry Quarry, Baltimore, Baltimore Co., Maryland, USA
657	Woodsboro Quarry (Lehigh Portland Cement Company), Frederick Co., Maryland, USA
658	Woodsboro, Frederick Co., Maryland, USA
659	Woodstock, Howard Co., Maryland, USA
660	Worth Brothers Quarry, Cecil Co., Maryland, USA
661	Worthington Quarries, Baltimore Co., Maryland, USA
662	Wright Quarry, Howard Co., Maryland, USA
663	Wyand Ore Bank, Washington Co., Maryland, USA
664	Yingling Ore Bank, Frederick Co., Maryland, USA
665	York and Peach Bottom Quarries, Cambria, Baltimore Co., Maryland, USA
666	Zepp Quarry, Howard Co., Maryland, USA
667	Zimmerman Ore Bank, Frederick Co., Maryland, USA
668	Zinkand Ore Bank, Baltimore Co., Maryland, USA
669	Zouck Quarry, Cavetown, Washington Co., Maryland, USA

The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database!