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Brighton Dam Road Quarry (Howard-Montgomery Quarry), Howard Co., Maryland, USAi
Regional Level Types
Brighton Dam Road Quarry (Howard-Montgomery Quarry)Quarry
Howard Co.County
MarylandState
USACountry

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PhotosMapsSearch
05553660014949180607666.jpg
Rutile

Brighton Dam Road Quarry, Howard Co., Maryland, USA
04622000015083800576483.jpg
Pyrrhotite, etc.

Brighton Dam Road Quarry, Howard Co., Maryland, USA
06049110015084193158180.jpg
Rutile

Brighton Dam Road Quarry, Howard Co., Maryland, USA
05553660014949180607666.jpg
Rutile

Brighton Dam Road Quarry, Howard Co., Maryland, USA
03289500015083802169562.jpg
Pyrrhotite, etc.

Brighton Dam Road Quarry, Howard Co., Maryland, USA
04275780015083811839191.jpg
Rutile

Brighton Dam Road Quarry, Howard Co., Maryland, USA
05553660014949180607666.jpg
Rutile

Brighton Dam Road Quarry, Howard Co., Maryland, USA
04622000015083800576483.jpg
Pyrrhotite, etc.

Brighton Dam Road Quarry, Howard Co., Maryland, USA
Latitude & Longitude (WGS84):
39° 11' 44'' North , 76° 59' 9'' West
Latitude & Longitude (decimal):
39.19556,-76.98583
GeoHash:
G#: dqcqbpkds
GRN:
N27W43
Locality type:
Quarry
KΓΆppen climate type:
Cfa : Humid subtropical climate
Nearest Settlements:
PlacePopulationDistance
Highland1,034 (2011)3.1km
Ashton-Sandy Spring5,628 (2011)5.4km
Brookeville139 (2018)6.5km
Fulton2,049 (2011)7.3km
Olney33,844 (2011)8.4km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Gem, Lapidary, and Mineral Society of Montgomery County, MD., Inc.Rockville, Maryland19km
Central Maryland Rock and Mineral Collectors ExchangeElkridge, Maryland24km
Baltimore Mineral SocietyBaltimore, Maryland34km
Chesapeake Gem & Mineral SocietyBaltimore, Maryland34km
Gem Cutters Guild of Baltimore, Inc.Baltimore, Maryland34km


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 Gallery Strunz Chemical Elements

Mineral List


14 valid minerals.

Detailed Mineral List:

β“˜ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
Reference: No reference listed; Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p.
β“˜ 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.
β“˜ 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.
β“˜ 'Chlorite Group'
Reference: No reference listed
β“˜ 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.
β“˜ Dravite
Formula: NaMg3Al6(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.
β“˜ 'Feldspar Group'
Reference: No reference listed
β“˜ 'K Feldspar'
Formula: KAlSi3O8
Reference: No reference listed
β“˜ 'K Feldspar var. Adularia'
Formula: KAlSi3O8
Reference: No reference listed
β“˜ 'Limonite'
Reference: No reference listed; Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p.
β“˜ 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.
β“˜ 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.
β“˜ 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.
β“˜ 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.
β“˜ 'Plagioclase'
Formula: (Na,Ca)[(Si,Al)AlSi2]O8
Reference: Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p.
trans.png
Pyrite

Brighton Dam Road Quarry, Howard Co., Maryland, USA
β“˜ 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.
trans.png
Pyrrhotite, etc.

Brighton Dam Road Quarry, Howard Co., Maryland, USA
β“˜ Pyrrhotite
Formula: Fe1-xS
Reference: No reference listed; Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p.
β“˜ Quartz
Formula: SiO2
Reference: Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p.
trans.png
Rutile

Brighton Dam Road Quarry, Howard Co., Maryland, USA
β“˜ 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.
β“˜ '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.
β“˜ 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.
β“˜ 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
β“˜Chalcopyrite2.CB.10aCuFeS2
β“˜Mackinawite2.CC.25(Fe,Ni)9S8
β“˜Pyrite2.EB.05aFeS2
β“˜Pyrrhotite2.CC.10Fe1-xS
Group 4 - Oxides and Hydroxides
β“˜Quartz4.DA.05SiO2
β“˜Rutile4.DB.05TiO2
Group 5 - Nitrates and Carbonates
β“˜Calcite5.AB.05CaCO3
β“˜Dolomite5.AB.10CaMg(CO3)2
β“˜Malachite5.BA.10Cu2(CO3)(OH)2
Group 9 - Silicates
β“˜Dravite9.CK.05NaMg3Al6(Si6O18)(BO3)3(OH)3(OH)
β“˜Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
β“˜Phlogopite9.EC.20KMg3(AlSi3O10)(OH)2
β“˜Talc9.EC.05Mg3Si4O10(OH)2
β“˜Tremolite9.DE.10β—»{Ca2}{Mg5}(Si8O22)(OH)2
Unclassified Minerals, Rocks, etc.
β“˜'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
β“˜'Chlorite Group'-
β“˜'Feldspar Group'-
β“˜'K Feldspar'-KAlSi3O8
β“˜'var. Adularia'-KAlSi3O8
β“˜'Limonite'-
β“˜'Plagioclase'-(Na,Ca)[(Si,Al)AlSi2]O8
β“˜'Scapolite'-

List of minerals for each chemical element

HHydrogen
Hβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
Hβ“˜ DraviteNaMg3Al6(Si6O18)(BO3)3(OH)3(OH)
Hβ“˜ MalachiteCu2(CO3)(OH)2
Hβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Hβ“˜ PhlogopiteKMg3(AlSi3O10)(OH)2
Hβ“˜ TalcMg3Si4O10(OH)2
Hβ“˜ Tremolite◻{Ca2}{Mg5}(Si8O22)(OH)2
BBoron
Bβ“˜ DraviteNaMg3Al6(Si6O18)(BO3)3(OH)3(OH)
CCarbon
Cβ“˜ CalciteCaCO3
Cβ“˜ DolomiteCaMg(CO3)2
Cβ“˜ MalachiteCu2(CO3)(OH)2
OOxygen
Oβ“˜ K Feldspar var. AdulariaKAlSi3O8
Oβ“˜ CalciteCaCO3
Oβ“˜ RutileTiO2
Oβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
Oβ“˜ DolomiteCaMg(CO3)2
Oβ“˜ DraviteNaMg3Al6(Si6O18)(BO3)3(OH)3(OH)
Oβ“˜ MalachiteCu2(CO3)(OH)2
Oβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Oβ“˜ PhlogopiteKMg3(AlSi3O10)(OH)2
Oβ“˜ TalcMg3Si4O10(OH)2
Oβ“˜ Tremolite◻{Ca2}{Mg5}(Si8O22)(OH)2
Oβ“˜ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Oβ“˜ QuartzSiO2
Oβ“˜ K FeldsparKAlSi3O8
FFluorine
Fβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
NaSodium
Naβ“˜ DraviteNaMg3Al6(Si6O18)(BO3)3(OH)3(OH)
Naβ“˜ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
MgMagnesium
Mgβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
Mgβ“˜ DolomiteCaMg(CO3)2
Mgβ“˜ DraviteNaMg3Al6(Si6O18)(BO3)3(OH)3(OH)
Mgβ“˜ PhlogopiteKMg3(AlSi3O10)(OH)2
Mgβ“˜ TalcMg3Si4O10(OH)2
Mgβ“˜ Tremolite◻{Ca2}{Mg5}(Si8O22)(OH)2
AlAluminium
Alβ“˜ K Feldspar var. AdulariaKAlSi3O8
Alβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
Alβ“˜ DraviteNaMg3Al6(Si6O18)(BO3)3(OH)3(OH)
Alβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Alβ“˜ PhlogopiteKMg3(AlSi3O10)(OH)2
Alβ“˜ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Alβ“˜ K FeldsparKAlSi3O8
SiSilicon
Siβ“˜ K Feldspar var. AdulariaKAlSi3O8
Siβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
Siβ“˜ DraviteNaMg3Al6(Si6O18)(BO3)3(OH)3(OH)
Siβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Siβ“˜ PhlogopiteKMg3(AlSi3O10)(OH)2
Siβ“˜ TalcMg3Si4O10(OH)2
Siβ“˜ Tremolite◻{Ca2}{Mg5}(Si8O22)(OH)2
Siβ“˜ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Siβ“˜ QuartzSiO2
Siβ“˜ K FeldsparKAlSi3O8
SSulfur
Sβ“˜ PyriteFeS2
Sβ“˜ PyrrhotiteFe1-xS
Sβ“˜ ChalcopyriteCuFeS2
Sβ“˜ Mackinawite(Fe,Ni)9S8
KPotassium
Kβ“˜ K Feldspar var. AdulariaKAlSi3O8
Kβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
Kβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Kβ“˜ PhlogopiteKMg3(AlSi3O10)(OH)2
Kβ“˜ K FeldsparKAlSi3O8
CaCalcium
Caβ“˜ CalciteCaCO3
Caβ“˜ DolomiteCaMg(CO3)2
Caβ“˜ Tremolite◻{Ca2}{Mg5}(Si8O22)(OH)2
Caβ“˜ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
TiTitanium
Tiβ“˜ RutileTiO2
Tiβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
FeIron
Feβ“˜ PyriteFeS2
Feβ“˜ PyrrhotiteFe1-xS
Feβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
Feβ“˜ ChalcopyriteCuFeS2
Feβ“˜ Mackinawite(Fe,Ni)9S8
NiNickel
Niβ“˜ Mackinawite(Fe,Ni)9S8
CuCopper
Cuβ“˜ ChalcopyriteCuFeS2
Cuβ“˜ MalachiteCu2(CO3)(OH)2

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Edwards, J. (1971) Directory of mineral producers in Maryland: Maryland Geological Survey Information Circular 11: 15.
MESA Health and Safety Inspection Report January 31 & February 1, 1972.
Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p.

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