Brighton Dam Road Quarry (Howard-Montgomery Quarry), Howard Co., Maryland, USA

Latitude & Longitude (WGS84): | 39° 11' 44'' North , 76° 59' 9'' West |
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Latitude & Longitude (decimal): | 39.19556,-76.98583 |
GeoHash: | G#: dqcqbpkds |
Locality type: | Quarry |
Köppen climate type: | Cfa : Humid subtropical climate |
This quarry was in a somewhat schistose to gneissic phase of the Cockeysville Marble along the southern flank of the Clarksville gneiss dome. It was operated by the Howard-Montgomery Crushed Stone Company, a division of Contee Sand and Gravel. The Howard/Montgomery Quarry is now filled with water and is located in the middle of an upscale residential neighborhood. The grounds of the quarry are posted "No Trespassing."
Select Mineral List Type
Standard Detailed Strunz Dana Chemical ElementsMineral List
14 valid minerals.
Detailed Mineral List:
ⓘ 'Albite-Anorthite Series' Reference: Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p. |
ⓘ 'Biotite' Reference: No reference listed; Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p. |
ⓘ Calcite Formula: CaCO3 Reference: No reference listed; Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p. |
ⓘ Chalcopyrite Formula: CuFeS2 Reference: No reference listed; Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p. |
ⓘ 'Chlorite Group' Reference: No reference listed |
ⓘ Dolomite Formula: CaMg(CO3)2 Reference: No reference listed; Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p. |
ⓘ Dravite Formula: Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH) Reference: No reference listed; Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p. |
ⓘ 'Feldspar Group' Reference: No reference listed |
ⓘ 'K Feldspar' Reference: No reference listed |
ⓘ 'K Feldspar var: Adularia' Formula: KAlSi3O8 Reference: No reference listed |
ⓘ 'Limonite' Formula: (Fe,O,OH,H2O) Reference: No reference listed; Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p. |
ⓘ Mackinawite Formula: (Fe,Ni)9S8 Description: with pyrrhotite Reference: Mines of the Washington D.C Area; Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p. |
ⓘ Malachite Formula: Cu2(CO3)(OH)2 Reference: Mines of the Washington D.C Area; Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p. |
ⓘ Muscovite Formula: KAl2(AlSi3O10)(OH)2 Reference: Mines of the Washington D.C Area; Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p. |
ⓘ Phlogopite Formula: KMg3(AlSi3O10)(OH)2 Reference: Mines of the Washington D.C Area; Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p. |
ⓘ Pyrite Formula: FeS2 Reference: No reference listed; Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p. |
ⓘ Pyrrhotite Formula: Fe7S8 Reference: No reference listed; Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p. |
ⓘ Quartz Formula: SiO2 Reference: Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p. |
ⓘ Rutile Formula: TiO2 Reference: No reference listed; Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p. |
ⓘ 'Scapolite' Reference: Mines of the Washington D.C Area; Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p. |
ⓘ Talc Formula: Mg3Si4O10(OH)2 Reference: Mines of the Washington D.C Area; Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p. |
ⓘ Tremolite Formula: ☐{Ca2}{Mg5}(Si8O22)(OH)2 Reference: Mines of the Washington D.C Area; Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p. |
List of minerals arranged by Strunz 10th Edition classification
Group 2 - Sulphides and Sulfosalts | |||
---|---|---|---|
ⓘ | 'Chalcopyrite' | 2.CB.10a | CuFeS2 |
ⓘ | 'Mackinawite' | 2.CC.25 | (Fe,Ni)9S8 |
ⓘ | 'Pyrite' | 2.EB.05a | FeS2 |
ⓘ | 'Pyrrhotite' | 2.CC.10 | Fe7S8 |
Group 4 - Oxides and Hydroxides | |||
ⓘ | 'Quartz' | 4.DA.05 | SiO2 |
ⓘ | 'Rutile' | 4.DB.05 | TiO2 |
Group 5 - Nitrates and Carbonates | |||
ⓘ | 'Calcite' | 5.AB.05 | CaCO3 |
ⓘ | 'Dolomite' | 5.AB.10 | CaMg(CO3)2 |
ⓘ | 'Malachite' | 5.BA.10 | Cu2(CO3)(OH)2 |
Group 9 - Silicates | |||
ⓘ | 'Dravite' | 9.CK.05 | Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH) |
ⓘ | 'Muscovite' | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
ⓘ | 'Phlogopite' | 9.EC.20 | KMg3(AlSi3O10)(OH)2 |
ⓘ | 'Talc' | 9.EC.05 | Mg3Si4O10(OH)2 |
ⓘ | 'Tremolite' | 9.DE.10 | ☐{Ca2}{Mg5}(Si8O22)(OH)2 |
Unclassified Minerals, Rocks, etc. | |||
ⓘ | 'Albite-Anorthite Series' | - | |
ⓘ | 'Biotite' | - | |
ⓘ | 'Chlorite Group' | - | |
ⓘ | 'Feldspar Group' | - | |
ⓘ | 'K Feldspar' | - | |
ⓘ | 'var: Adularia' | - | KAlSi3O8 |
ⓘ | 'Limonite' | - | (Fe,O,OH,H2O) |
ⓘ | 'Scapolite' | - |
List of minerals arranged by Dana 8th Edition classification
Group 2 - SULFIDES | |||
---|---|---|---|
AmBnXp, with (m+n):p = 9:8 | |||
ⓘ | Mackinawite | 2.7.2.1 | (Fe,Ni)9S8 |
AmXp, with m:p = 1:1 | |||
ⓘ | Pyrrhotite | 2.8.10.1 | Fe7S8 |
AmBnXp, with (m+n):p = 1:1 | |||
ⓘ | Chalcopyrite | 2.9.1.1 | CuFeS2 |
AmBnXp, with (m+n):p = 1:2 | |||
ⓘ | Pyrite | 2.12.1.1 | FeS2 |
Group 4 - SIMPLE OXIDES | |||
AX2 | |||
ⓘ | Rutile | 4.4.1.1 | TiO2 |
Group 14 - ANHYDROUS NORMAL CARBONATES | |||
A(XO3) | |||
ⓘ | Calcite | 14.1.1.1 | CaCO3 |
AB(XO3)2 | |||
ⓘ | Dolomite | 14.2.1.1 | CaMg(CO3)2 |
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN | |||
ⓘ | Malachite | 16a.3.1.1 | Cu2(CO3)(OH)2 |
Group 61 - CYCLOSILICATES Six-Membered Rings | |||
Six-Membered Rings with borate groups | |||
ⓘ | Dravite | 61.3.1.9 | Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH) |
Group 66 - INOSILICATES Double-Width,Unbranched Chains,(W=2) | |||
Amphiboles - Mg-Fe-Mn-Li subgroup | |||
ⓘ | Tremolite | 66.1.3a.1 | ☐{Ca2}{Mg5}(Si8O22)(OH)2 |
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings | |||
Sheets of 6-membered rings with 2:1 layers | |||
ⓘ | Muscovite | 71.2.2a.1 | KAl2(AlSi3O10)(OH)2 |
ⓘ | Phlogopite | 71.2.2b.1 | KMg3(AlSi3O10)(OH)2 |
ⓘ | Talc | 71.2.1.3 | Mg3Si4O10(OH)2 |
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks | |||
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si | |||
ⓘ | Quartz | 75.1.3.1 | SiO2 |
Unclassified Minerals, Rocks, etc. | |||
ⓘ | 'Albite-Anorthite Series' | - | |
ⓘ | 'Biotite' | - | |
ⓘ | 'Chlorite Group' | - | |
ⓘ | 'Feldspar Group' | - | |
ⓘ | 'K Feldspar' | - | |
ⓘ | 'var: Adularia' | - | KAlSi3O8 |
ⓘ | 'Limonite' | - | (Fe,O,OH,H2O) |
ⓘ | 'Scapolite' | - |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | ⓘ Dravite | Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH) |
H | ⓘ Limonite | (Fe,O,OH,H2O) |
H | ⓘ Malachite | Cu2(CO3)(OH)2 |
H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
H | ⓘ Phlogopite | KMg3(AlSi3O10)(OH)2 |
H | ⓘ Talc | Mg3Si4O10(OH)2 |
H | ⓘ Tremolite | ☐{Ca2}{Mg5}(Si8O22)(OH)2 |
B | Boron | |
B | ⓘ Dravite | Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH) |
C | Carbon | |
C | ⓘ Calcite | CaCO3 |
C | ⓘ Dolomite | CaMg(CO3)2 |
C | ⓘ Malachite | Cu2(CO3)(OH)2 |
O | Oxygen | |
O | ⓘ K Feldspar (var: Adularia) | KAlSi3O8 |
O | ⓘ Calcite | CaCO3 |
O | ⓘ Dolomite | CaMg(CO3)2 |
O | ⓘ Dravite | Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH) |
O | ⓘ Limonite | (Fe,O,OH,H2O) |
O | ⓘ Malachite | Cu2(CO3)(OH)2 |
O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
O | ⓘ Phlogopite | KMg3(AlSi3O10)(OH)2 |
O | ⓘ Quartz | SiO2 |
O | ⓘ Rutile | TiO2 |
O | ⓘ Talc | Mg3Si4O10(OH)2 |
O | ⓘ Tremolite | ☐{Ca2}{Mg5}(Si8O22)(OH)2 |
Na | Sodium | |
Na | ⓘ Dravite | Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH) |
Mg | Magnesium | |
Mg | ⓘ Dolomite | CaMg(CO3)2 |
Mg | ⓘ Dravite | Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH) |
Mg | ⓘ Phlogopite | KMg3(AlSi3O10)(OH)2 |
Mg | ⓘ Talc | Mg3Si4O10(OH)2 |
Mg | ⓘ Tremolite | ☐{Ca2}{Mg5}(Si8O22)(OH)2 |
Al | Aluminium | |
Al | ⓘ K Feldspar (var: Adularia) | KAlSi3O8 |
Al | ⓘ Dravite | Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH) |
Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
Al | ⓘ Phlogopite | KMg3(AlSi3O10)(OH)2 |
Si | Silicon | |
Si | ⓘ K Feldspar (var: Adularia) | KAlSi3O8 |
Si | ⓘ Dravite | Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH) |
Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
Si | ⓘ Phlogopite | KMg3(AlSi3O10)(OH)2 |
Si | ⓘ Quartz | SiO2 |
Si | ⓘ Talc | Mg3Si4O10(OH)2 |
Si | ⓘ Tremolite | ☐{Ca2}{Mg5}(Si8O22)(OH)2 |
S | Sulfur | |
S | ⓘ Chalcopyrite | CuFeS2 |
S | ⓘ Mackinawite | (Fe,Ni)9S8 |
S | ⓘ Pyrite | FeS2 |
S | ⓘ Pyrrhotite | Fe7S8 |
K | Potassium | |
K | ⓘ K Feldspar (var: Adularia) | KAlSi3O8 |
K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
K | ⓘ Phlogopite | KMg3(AlSi3O10)(OH)2 |
Ca | Calcium | |
Ca | ⓘ Calcite | CaCO3 |
Ca | ⓘ Dolomite | CaMg(CO3)2 |
Ca | ⓘ Tremolite | ☐{Ca2}{Mg5}(Si8O22)(OH)2 |
Ti | Titanium | |
Ti | ⓘ Rutile | TiO2 |
Fe | Iron | |
Fe | ⓘ Chalcopyrite | CuFeS2 |
Fe | ⓘ Limonite | (Fe,O,OH,H2O) |
Fe | ⓘ Mackinawite | (Fe,Ni)9S8 |
Fe | ⓘ Pyrite | FeS2 |
Fe | ⓘ Pyrrhotite | Fe7S8 |
Ni | Nickel | |
Ni | ⓘ Mackinawite | (Fe,Ni)9S8 |
Cu | Copper | |
Cu | ⓘ Chalcopyrite | CuFeS2 |
Cu | ⓘ Malachite | Cu2(CO3)(OH)2 |
Regional Geology
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
Proterozoic 541 - 2500 Ma ID: 2935545 | Cockeysville Marble Age: Proterozoic (541 - 2500 Ma) Stratigraphic Name: Cockeysville Marble Description: Metadolomite, calc-schist, and calcite marble are predominant; calc-gneiss and calc-silicate marble widespread but minor; thickness about 750 feet. Comments: secondary unit description from USGS Geologic Names lexicon (ref MD004): Author has erected a six-fold stratigraphy for the Cockeysville consisting of five unnamed members and one lens to accommodate the variety of rock types. These are the layered marble member (0 to 200 m), the massive metadolostone member (0 to 400 m), the layered metadolostone member (0 to 1.4 km), the massive metalimestone member (0 to 450 m), which includes the calc-gneiss lens (0 to 225 m), and the phlogopitic metalimestone member (0 to 300 m). Each member is described in detail. Thickness of the Cockeysville overall varies from 0 to 1.4 km, the range of the layered metadolostone. The relative ages of these units are uncertain. Unit as a whole is mapped as Cambrian to Ordovician(?). Original map source: In 1995 the Water Resources Division of the U.S. Geological Survey digitized the geologic map of Maryland from the 1968 paper map (Reference MD001). Information about products from the Maryland Geological Survey can be found at http://www.mgs.md.gov/. Lithology: Major:{marble}, Minor:{calc silicate schist}, Incidental:{calc silicate gneiss} Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133] |
Mesoproterozoic 1000 - 1600 Ma ID: 3193072 | Mesoproterozoic crystalline metamorphic rocks Age: Mesoproterozoic (1000 - 1600 Ma) Lithology: Orthogneiss Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154] |
Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License
Brighton Dam Road Quarry, Howard Co., Maryland, USA