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:
Rockville, Montgomery Co., Maryland, USA


mindat Locality ID: 23075
mindat URL: http://www.mindat.org/loc-23075.html

Tectonic Settings:

Total number of sublocalities beneath "Rockville, Montgomery Co., Maryland, USA": 3
Total number of bottom-level sublocalities: 3

Number of Child Localities: 3
Child Localities:
Bogley Mine
Huddlestone Mine
Hunting Hill Quarry (Rockville Crushed Stone Quarry; Travilah Quarry; Rockville Quarry; Bardon Stone Quarry; Aggregate Industries Quarry)

Latitude: 39°3'59"N
Longitude: 77°9'"W
Decimal Degree (lat, lon): 39.066388888889,-77.15
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 Au B C Ca Cr Cu F Fe H Mg Mn Mo Na Ni O P Pb S Si Ti 

Elements from minerals reported directly at this locality: 

Structural Groups for minerals in this locality: 
AmorphousAmphiboleApatiteAragoniteBrochantiteBruciteCalciteChalcopyriteChloriteClay
ClinozoisiteCopperCorundumDiasporeEpidoteFeldsparGarnetHydrotalciteMalachiteMillerite
MolybdeniteNickelineNoneNot in a structural groupPentlanditePrehnitePyritePyroxeneQuartzRocksalt
RutileSerpentineSpinelTalcTitaniteTochiliniteTourmalineVesuvianite

59 IMA Minerals at location:
Actinolite  (*)Albite  (*)Ankerite  (*)Anthophyllite  (*)Antigorite  (*)
Aragonite  (*)Azurite  (*)Bornite  (*)Brochantite  (*)Brucite  (*)
Calcite  (*)Chalcocite  (*)Chalcopyrite  (*)Chromite  (*)Chrysotile  (*)
Clinochlore  (*)Clinozoisite  (*)Coalingite  (*)Desautelsite  (*)Diopside  (*)
Dolomite  (*)Dravite  (*)Epidote  (*)Fluorapatite  (*)Galena  (*)
Goethite  (*)Gold  (*)Grossular  (*)Hematite  (*)Huntite  (*)
Hydromagnesite  (*)Ilmenite  (*)Lizardite  (*)Magnesio-hornblende  (*)Magnesite  (*)
Magnetite  (*)Malachite  (*)Mcguinnessite  (*)Millerite  (*)Molybdenite  (*)
Nimite  (*)Omphacite  (*)Opal  (*)Pargasite  (*)Pentlandite  (*)
Pokrovskite  (*)Prehnite  (*)Pyrite  (*)Pyrrhotite  (*)Quartz  (*)
Rutile  (*)Schorl  (*)Talc  (*)Titanite  (*)Tochilinite  (*)
Tremolite  (*)Vesuvianite  (*)Xonotlite  (*)Zoisite  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Actinolite  (*)Amphibole   Ca2(Mg4.5-2.5Fe2+0.5-2.5)Si8O22(OH)212189573419
Albite  (*)FeldsparNa(AlSi3O8)12189578803
Ankerite  (*)NoneCa(Fe2+,Mg)(CO3)212189563092
Anthophyllite  (*)Amphibole   Mg2Mg5Si8O22(OH)21218957718
Antigorite  (*)Serpentine ClayMg3Si2O5(OH)41218957708
Aragonite  (*)AragoniteCa(CO3)12189573250
Azurite  (*)Not in a structural groupCu3(CO3)2(OH)212189575509
Bornite  (*)NoneCu5FeS412189575516
Brochantite  (*)BrochantiteCu4(SO4)(OH)612189571633
Brucite  (*)BruciteMg(OH)21218957462
Calcite  (*)CalciteCa(CO3)121895727770
Chalcocite  (*)NoneCu2S12189575707
Chalcopyrite  (*)ChalcopyriteCuFeS2121895727198
Chromite  (*)SpinelFe2+Cr2O412189573902
Chrysotile  (*)Serpentine ClayMg3Si2O5(OH)41218957951
Clinochlore  (*)Chlorite ClayMg5Al(AlSi3O10)(OH)812189571756
Clinozoisite  (*)Clinozoisite EpidoteCa2Al3[Si2O7][SiO4]O(OH)12189571025
Coalingite  (*)HydrotalciteMg10Fe3+2(CO3)(OH)24·2H2O121895727
Desautelsite  (*)HydrotalciteMg6Mn3+2(CO3)(OH)16·4H2O12189579
Diopside  (*)PyroxeneCaMgSi2O612189574135
Dolomite  (*)NoneCaMg(CO3)212189579895
Dravite  (*)TourmalineNaMg3Al6(Si6O18)(BO3)3(OH)3(OH)1218957648
Epidote  (*)Epidote ClinozoisiteCa2(Al2Fe3+)[Si2O7][SiO4]O(OH)12189578173
Fluorapatite  (*)ApatiteCa5(PO4)3F12189572740
Galena  (*)RocksaltPbS121895724243
Goethite  (*)DiasporeFeO(OH)12189577437
Gold  (*)CopperAu2218955,21895630554
Grossular  (*)GarnetCa3Al2(SiO4)312189571544
Hematite  (*)CorundumFe2O3121895714640
Huntite  (*)Not in a structural groupCaMg3(CO3)4121895769
Hydromagnesite  (*)NoneMg5(CO3)4(OH)2·4H2O1218957341
Ilmenite  (*)CorundumFe2+Ti4+O312189575433
Lizardite  (*)Serpentine ClayMg3Si2O5(OH)41218957359
Magnesio-hornblende  (*)Amphibole   Ca2(Mg4Al)(Si7Al)O22(OH)21218957238
Magnesite  (*)CalciteMg(CO3)12189571487
Magnetite  (*)SpinelFe2+Fe3+2O4121895714899
Malachite  (*)MalachiteCu2(CO3)(OH)2121895712537
Mcguinnessite  (*)MalachiteCuMg(CO3)(OH)2121895734
Millerite  (*)MilleriteNiS12189571066
Molybdenite  (*)MolybdeniteMoS212189575800
Nimite  (*)Chlorite Clay(Ni,Mg,Al)6(Si,Al)4O10(OH)8121895715
Omphacite  (*)Pyroxene(Ca,Na)(Mg,Fe,Al)Si2O61218957229
Opal  (*)AmorphousSiO2·nH2O12189572994
Pargasite  (*)AmphiboleNaCa2(Mg4Al)(Si6Al2)O22(OH)21218957313
Pentlandite  (*)Pentlandite(Ni,Fe)9S812189571512
Pokrovskite  (*)MalachiteMg2(CO3)(OH)212189579
Prehnite  (*)PrehniteCa2Al(Si3Al)O10(OH)212189571898
Pyrite  (*)PyriteFeS22218956,21895739462
Pyrrhotite  (*)NickelineFe7S812189579056
Quartz  (*)QuartzSiO22218956,21895761156
Rutile  (*)RutileTiO212189575614
Schorl  (*)TourmalineNaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)12189562705
Talc  (*)Clay TalcMg3Si4O10(OH)22218956,2189573337
Titanite  (*)TitaniteCaTi(SiO4)O12189574899
Tochilinite  (*)Tochilinite6(Fe0.9S)·5[(Mg,Fe)(OH)2]121895756
Tremolite  (*)Amphibole   Ca2(Mg5.0-4.5Fe2+0.0-0.5)Si8O22(OH)212189572562
Vesuvianite  (*)Vesuvianite(Ca,Na)19(Al,Mg,Fe)13(SiO4)10(Si2O7)4(OH,F,O)1012189571395
Xonotlite  (*)NoneCa6Si6O17(OH)21218957109
Zoisite  (*)EpidoteCa2Al3[Si2O7][SiO4]O(OH)12189571025


No ages have been assigned to this locality yet.
SampleSource LocalityReference URL
R110197Hunting Hill Quarry (Rockville Crushed Stone Quarry; Travilah Quarry; Rockville Quarry; Bardon Stone Quarry; Aggregate Industries Quarry), Rockville, Montgomery Co., Maryland, USAhttps://rruff.info/R110197

All locality data graciously provided by mindat.org

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