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Maryland, USA
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One of the thirteen original states of the USA.

Maryland's geological diversity is impressive for such a small state and can serve as a cross-section for Appalachian geology. Going from west to east, the state contains a portion of the Allegheny Plateau in Garrett County, the folded Valley and Ridge Province, the Blue Ridge just west of Frederick, a Triassic-Jurassic Fault basin, Piedmont Plateau igneous and metamorphic rocks and the Cretaceous to Quaternary Coastal Plain province. Estuarine and coastal landforms also are well developed along the Chesapeake Bay and Atlantic coastline.

Some of the state's more notable mineral collecting localities are as follows. Many interesting minerals are found in the state's ultramafic rocks such as those exposed in the Hunting Hill Quarry in Montgomery County, the Bare Hills in Baltimore County and numerous pits worked for chromite, talc and verde antique in Harford and Cecil Counties. Several interesting old copper mine districts occur in Baltimore, Carroll and Frederick Counties, including the type locality for carrollite. Gold deposits near Great Falls in Montgomery County have fueled several small gold rushes. The Cambrian Cockeysville marble furnishes interesting collecting in quarries in Baltimore and Howard Counties. The Piedmont Plateau rocks contain collectable metamorphic minerals such as garnet, staurolite and kyanite. Selenite gypsum crystal clusters, iron phosphates and vivianite nodules have been found in the Coastal Plain province in Prince Georges and other Counties.

The urban to suburban nature of the state means that old deposits are frequently obscured or obliterated by development. However the diverse geology renders of interest any new exposure, even if only temporarily available for collecting and study.

Mineral List

Mineral list contains entries from the region specified including sub-localities
Actinolite
Albite
var: Oligoclase
'Albite-Anorthite Series'
'Allanite'
Almandine
'Almandine-Spessartine Series'
'Alum Group'
'Amber'
Amphibole Supergroup
var: Byssolite

Analcime
Anglesite
Anhydrite
Ankerite
Anthophyllite
Antigorite
var: Picrolite
var: Williamsite
'Apatite'
'Apophyllite'
Aragonite
Arfvedsonite
Arsenopyrite
'Asbestos
var: Mountain Leather'

Augite
Aurichalcite
Autunite
Awaruite
'Azovskite'
Azurite
Baryte
Beidellite
Bertrandite
Beryl
var: Aquamarine
var: Heliodor
'Biotite'
Bornite
Brochantite
Brucite
Cacoxenite
'Calamine'
Calcite
var: Iceland Spar
var: Manganoan Calcite
Carrollite (TL)
Cerussite
'Chabazite'
Chabazite-Ca
var: Haydenite (TL)
Chalcanthite
Chalcocite
Chalcopyrite
'Chlorite Group'
Chromite
Chrysocolla
Chrysotile
'Clay'
Clinochlore
Clinochlore
var: Chromian Clinochlore

var: Ripidolite
Clinozoisite
'Coal
var: Bituminous Coal'

'var: Jet'
Coalingite
'Columbite'
Copper
Corundum
Covellite
Cummingtonite
Cuprite
var: Chalcotrichite
Desautelsite
'Deweylite'
Dickite
Diopside
var: Chromian Diopside
Dolomite
Dravite
var: Chromian Dravite
Enstatite
var: Bronzite
Epidote
'Fairbanksite'
'Feldspar Group'
Felsőbányaite
Ferro-hornblende
'Flint'
Fluorapatite
Fluorite
Forsterite
Gahnite
Galena
'Garnet'
'Garnierite'
Glauconite
Goethite
Gold
var: Electrum
Graphite
Grossular
Gypsum
var: Selenite
'Halloysite'
Harmotome
Heazlewoodite
Hematite
var: Specularite
Hemimorphite
'Heulandite'
Heulandite-Ca
var: Beaumontite (of Lévy) (TL)
'Hornblende'
Huntite
'Hydrogrossular'
Hydromagnesite
Hydrozincite
Idaite
Ilmenite
Jarosite
Kaolinite
'K Feldspar'
'var: Adularia'
Kyanite
Laumontite
'Lepidomelane'
'Limonite'
Linnaeite
Lipscombite
Lizardite
Mackinawite
Magnesiochromite
Magnesite
var: Breunnerite
Magnetite
Malachite
'Manganese Oxides
var: Manganese Dendrites'

Marcasite
Margarite
Maucherite
Mcguinnessite
Melanterite
'Mica Group'
Microcline
Millerite
Molybdenite
Muscovite
var: Fuchsite
var: Sericite
Natrolite
Nimite
Nontronite
'Ochre'
'Olivine'
Omphacite
Opal
var: Diatomite
var: Opal-AN
Orthoclase
Ottrélite
Pargasite
Pentlandite
'Petrified Wood'
'Phillipsite'
Phlogopite
Phosphosiderite
Pokrovskite
Prehnite
Pseudomalachite
'Psilomelane'
Pyrite
Pyroaurite
Pyrolusite
Pyrophyllite
Pyrrhotite
Quartz
var: Amethyst
Quartz
var: Blue Quartz

var: Chalcedony
var: Jasper
var: Milky Quartz
var: Moss Agate
var: Rock Crystal
var: Rutilated Quartz
var: Smoky Quartz
'Remingtonite' (TL)
Riebeckite
Rockbridgeite
Rosasite
Rutile
'Scapolite'
'var: Wernerite'
Schorl
Scolecite
'Serpentine Group'
Siderite
var: Sphärosiderite
Siegenite
Sillimanite
Silver
Smithsonite
Spessartine
Sphalerite
Spinel
Staurolite
Stibnite
'Stilbite'
Strontianite
Sulphur
Talc
'Tantalite'
Tenorite
Tetradymite
Tetrahedrite
Titanite
Tochilinite
Todorokite
Torbernite
'Tourmaline'
Tremolite
Uraninite
Vermiculite
Vesuvianite
Violarite
Vivianite
'Wad'
Wollastonite
Wulfenite
Xonotlite
'Zaratite'
Zircon
Zoisite
var: Thulite


240 entries listed. 151 valid minerals. 1 type locality (valid mineral). 3 type localities (others).

Localities in this Region

USA
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. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Ostrander, C. W. & W. E. Price Jr. (1940) Minerals of Maryland: Natural History Society of Maryland, 92 p.

Pearre, N. & A. V. Heyl (1960) Mineral deposits in serpentine rocks of the Piedmont Upland, Maryland, Pennsylvania and Delaware: U. S. Geological Survey: Bulletin 1082K: 707-833.

Pearre, Nancy (1961) Mineral deposits of Maryland excluding fuel, sand and gravel: U.S. Geological Survey Mineral Investigations Resources Map MR-12.

Heyl, A. & Pearre, N (1965) Copper, zinc, lead, iron cobalt and barite deposits of the Piedmont Upland in Maryland: Maryland Geological Survey: Bulletin 28, 72 p.

Vokes, H. E., revised by J. Edwards (1974) Geography and Geology of Maryland: Maryland Geological Survey Bulletin 19, 242 p.

Bernstein, Lawrence (1976) Minerals of Washington D.C. and vicinity: U.S. Geological Survey: Open File Report 76-849, 183 p.

Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p.

Schmidt, M.F. & M. F. Schmidt Jr. (2010) Maryland's Geology: Schiffer Publications, 164 p.

Means, J. (2010) Roadside geology of Maryland, Delaware and Washington, D.C.: Mountain Press Publishers, 346 p.

External Links


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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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