Mineral Evolution Database
Created and maintained by the Mineral Evolution Project in partnership with RRUFF and mindat.
Mineral locality data provided by mindat.org



The Mineral Evolution database is currently under development.

The goal of this page is to present localities at which the mineral is found, and estimates of the oldest possible geologic age of the minerals at these localities.


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


mindat Locality ID: 3821
mindat URL: http://www.mindat.org/loc-3821.html

Tectonic Settings:

Total number of sublocalities beneath "Brighton Dam Road Quarry (Howard-Montgomery Quarry), Howard Co., Maryland, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 39°11'44"N
Longitude: 76°59'9"W
Decimal Degree (lat, lon): 39.195555555556,-76.985833333333
AThis mineral is Anthropogenic.
GThis mineral is directly dated.
BThis mineral is reported as having this age.
YThis mineral is using an age reported as an element mineralization period.
OThis mineral is using an age calculated from all data at the locality.
RThe age displayed for this mineral originates from a different, non-child locality.
PThe age displayed for this mineral is the range of ages for this mineral at all of this locality's children.
This mineral's age has not yet been recorded.

This Mineral list contains entries from this locality, including sub-localities. Minerals in bold are reported by mindat.org as occurring directly at this locality, and do not occur at any children (sublocalities) of this locality.

Elements at this locality, including sub-localities: Al B C Ca Cu Fe H K Mg Na Ni O S Si Ti 

Elements from minerals reported directly at this locality: Al B C Ca Cu Fe H K Mg Na Ni O S Si Ti 

Structural Groups for minerals in this locality: 
AmphiboleCalciteChalcopyriteClayMalachiteMicaNickelineNonePyriteQuartz
RutileTalcTourmaline

14 IMA Minerals at location:
Calcite  (*)Chalcopyrite  (*)Dolomite  (*)Dravite  (*)Mackinawite  (*)
Malachite  (*)Muscovite  (*)Phlogopite  (*)Pyrite  (*)Pyrrhotite  (*)
Quartz  (*)Rutile  (*)Talc  (*)Tremolite  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Calcite  (*)CalciteCa(CO3)027770
Chalcopyrite  (*)ChalcopyriteCuFeS2027198
Dolomite  (*)NoneCaMg(CO3)209895
Dravite  (*)TourmalineNaMg3Al6(Si6O18)(BO3)3(OH)3(OH)0648
Mackinawite  (*)None(Fe,Ni)1+xS (x = 0-0.07)0451
Malachite  (*)MalachiteCu2(CO3)(OH)2012537
Muscovite  (*)Mica ClayKAl2(Si3Al)O10(OH)2017380
Phlogopite  (*)Mica ClayKMg3(AlSi3O10)(OH)202273
Pyrite  (*)PyriteFeS2039462
Pyrrhotite  (*)NickelineFe7S809056
Quartz  (*)QuartzSiO2061156
Rutile  (*)RutileTiO205614
Talc  (*)Clay TalcMg3Si4O10(OH)203337
Tremolite  (*)Amphibole   Ca2(Mg5.0-4.5Fe2+0.0-0.5)Si8O22(OH)202562


No ages have been assigned to this locality yet.
SampleSource LocalityReference URL

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