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:
Montgomery Co., Maryland, USA

mindat Locality ID: 23845
mindat URL: http://www.mindat.org/loc-23845.html

Tectonic Settings:

Total number of sublocalities beneath "Montgomery Co., Maryland, USA": 51
Total number of bottom-level sublocalities: 40

Number of Child Localities: 27
Child Localities:
B Giancola Quarry
Barnesville
Bethesda
Boyds
Brookeville Mine (MRDS - 10100512)
Burtonsville
Cropley
Dickerson
Earth Products Company Mines
Earth Products Company Quarries
Ednor
Ellicott Gold Mine (Sandy Spring Mine; Brookeville Mine)
Etchison Mine
Gaithersburg
Garrett Park
Lyd Griffith Property
Potomac
Rockville
Silver Spring
Stoneyhurst Quarry Number 1
Stoneyhurst Quarry Number 3
Stonyhurst Quarries
Sugarloaf Mountain
Toms Run Quarry
Unnamed Schist Quarry Near Cabin John Park (MRDS - 10068002)
Wheaton
White Oak

Latitude: 39°4'49"N
Longitude: 77°7'15"W
Decimal Degree (lat, lon): 39.080277777778,-77.120833333333

A	This mineral is Anthropogenic.
G	This mineral is directly dated.
B	This mineral is reported as having this age.
Y	This mineral is using an age reported as an element mineralization period.
O	This mineral is using an age calculated from all data at the locality.
R	The age displayed for this mineral originates from a different, non-child locality.
P	The 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.

Amorphous	Amphibole	Apatite	Aragonite	Arsenopyrite	Autunite	Beryl	Brochantite	Brucite	Calcite
Chalcopyrite	Chlorite	Clay	Clinozoisite	Copper	Corundum	Covellite	Diaspore	Epidote	Feldspar
Fluorite	Garnet	Hydrotalcite	Malachite	Mica	Millerite	Molybdenite	Nickeline	None	Not in a structural group
Pentlandite	Prehnite	Pyrite	Pyroxene	Quartz	Rocksalt	Rutile	Serpentine	Sphalerite	Spinel
Staurolite	Talc	Tetradymite	Titanite	Tochilinite	Tourmaline	Vesuvianite

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: Ag Al As Au B Be Bi C Ca Cr Cu F Fe H K Mg Mn Mo Na Ni O P Pb S Si Te Ti U Zn

Elements from minerals reported directly at this locality: Mn O

Structural Groups for minerals in this locality:
Amorphous Amphibole Apatite Aragonite Arsenopyrite Autunite Beryl Brochantite Brucite Calcite
Chalcopyrite Chlorite Clay Clinozoisite Copper Corundum Covellite Diaspore Epidote Feldspar
Fluorite Garnet Hydrotalcite Malachite Mica Millerite Molybdenite Nickeline None Not in a structural group
Pentlandite Prehnite Pyrite Pyroxene Quartz Rocksalt Rutile Serpentine Sphalerite Spinel
Staurolite Talc Tetradymite Titanite Tochilinite Tourmaline Vesuvianite

80 IMA Minerals at location:

Actinolite ()*	Albite ()*	Almandine ()*	Ankerite ()*	Anthophyllite ()*
Antigorite ()*	Aragonite ()*	Arsenopyrite ()*	Autunite ()*	Azurite ()*
Bertrandite ()*	Beryl ()*	Bornite ()*	Brochantite ()*	Brucite ()*
Calcite ()*	Chalcocite ()*	Chalcopyrite ()*	Chromite ()*	Chrysotile ()*
Clinochlore ()*	Clinozoisite ()*	Coalingite ()*	Copper ()*	Covellite ()*
Desautelsite ()*	Diopside ()*	Dolomite ()*	Dravite ()*	Epidote ()*
Fluorapatite ()*	Gahnite ()*	Galena ()*	Goethite ()*	Gold ()*
Grossular ()*	Hematite ()*	Huntite ()*	Hydromagnesite ()*	Ilmenite ()*
Laumontite ()*	Lizardite ()*	Magnesio-hornblende ()*	Magnesiochromite ()*	Magnesite ()*
Magnetite ()*	Malachite ()*	Mcguinnessite ()*	Microcline ()*	Millerite ()*
Molybdenite ()*	Muscovite ()*	Nimite ()*	Omphacite ()*	Opal ()*
Pargasite ()*	Pentlandite ()*	Pokrovskite ()*	Prehnite ()*	Pyrite ()*
Pyrolusite ()*	Pyrrhotite ()*	Quartz ()*	Rutile ()*	Schorl ()*
Siderite ()*	Silver ()*	Spessartine ()*	Sphalerite ()*	Staurolite ()*
Talc ()*	Tetradymite ()*	Titanite ()*	Tochilinite ()*	Torbernite ()*
Tremolite ()*	Uraninite ()*	Vesuvianite ()*	Xonotlite ()*	Zoisite ()*

Mineral name	Structural Groups	IMA Formula	# of Sublocalities containing mineral	LOCALITY IDs, not mindat ids	# of localities containing mineral
Actinolite ()*	Amphibole	Ca₂(Mg_4.5-2.5Fe²⁺_0.5-2.5)Si₈O₂₂(OH)₂	1	218957	3419
Albite ()*	Feldspar	Na(AlSi₃O₈)	3	218937,218957,218968	8803
Almandine ()*	Garnet	Fe²⁺₃Al₂(SiO₄)₃	1	218959	2353
Ankerite ()*	None	Ca(Fe²⁺,Mg)(CO₃)₂	2	218950,218956	3092
Anthophyllite ()*	Amphibole	Mg₂Mg₅Si₈O₂₂(OH)₂	1	218957	718
Antigorite ()*	Serpentine Clay	Mg₃Si₂O₅(OH)₄	1	218957	708
Aragonite ()*	Aragonite	Ca(CO₃)	1	218957	3250
Arsenopyrite ()*	Arsenopyrite	FeAsS	1	218950	9052
Autunite ()*	Autunite	Ca(UO₂)₂(PO₄)₂·10-12H₂O	1	218968	1272
Azurite ()*	Not in a structural group	Cu₃(CO₃)₂(OH)₂	3	218943,218957,218969	5509
Bertrandite ()*	Not in a structural group	Be₄Si₂O₇(OH)₂	1	218968	606
Beryl ()*	Beryl	Be₃Al₂Si₆O₁₈	2	218937,218968	4286
Bornite ()*	None	Cu₅FeS₄	1	218957	5516
Brochantite ()*	Brochantite	Cu₄(SO₄)(OH)₆	1	218957	1633
Brucite ()*	Brucite	Mg(OH)₂	1	218957	462
Calcite ()*	Calcite	Ca(CO₃)	2	218936,218957	27770
Chalcocite ()*	None	Cu₂S	1	218957	5707
Chalcopyrite ()*	Chalcopyrite	CuFeS₂	3	218950,218957,218969	27198
Chromite ()*	Spinel	Fe²⁺Cr₂O₄	3	218942,218946,218957	3902
Chrysotile ()*	Serpentine Clay	Mg₃Si₂O₅(OH)₄	1	218957	951
Clinochlore ()*	Chlorite Clay	Mg₅Al(AlSi₃O₁₀)(OH)₈	1	218957	1756
Clinozoisite ()*	Clinozoisite Epidote	Ca₂Al₃[Si₂O₇][SiO₄]O(OH)	2	218957,218959	1025
Coalingite ()*	Hydrotalcite	Mg₁₀Fe³⁺₂(CO₃)(OH)₂₄·2H₂O	1	218957	27
Copper ()*	Copper	Cu	1	218943	3846
Covellite ()*	Covellite	CuS	1	218969	4165
Desautelsite ()*	Hydrotalcite	Mg₆Mn³⁺₂(CO₃)(OH)₁₆·4H₂O	1	218957	9
Diopside ()*	Pyroxene	CaMgSi₂O₆	1	218957	4135
Dolomite ()*	None	CaMg(CO₃)₂	2	218934,218957	9895
Dravite ()*	Tourmaline	NaMg₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)	1	218957	648
Epidote ()*	Epidote Clinozoisite	Ca₂(Al₂Fe³⁺)[Si₂O₇][SiO₄]O(OH)	4	218936,218943,218957,218959	8173
Fluorapatite ()*	Apatite	Ca₅(PO₄)₃F	2	218957,218968	2740
Gahnite ()*	Spinel	ZnAl₂O₄	2	218928,218968	445
Galena ()*	Rocksalt	PbS	4	218950,218951,218957,218959	24243
Goethite ()*	Diaspore	FeO(OH)	3	218950,218952,218957	7437
Gold ()*	Copper	Au	12	218923,218930,218933,218934,218941,218948,218949,218950,218951,218953,218955,218956	30554
Grossular ()*	Garnet	Ca₃Al₂(SiO₄)₃	1	218957	1544
Hematite ()*	Corundum	Fe₂O₃	3	218936,218943,218957	14640
Huntite ()*	Not in a structural group	CaMg₃(CO₃)₄	1	218957	69
Hydromagnesite ()*	None	Mg₅(CO₃)₄(OH)₂·4H₂O	1	218957	341
Ilmenite ()*	Corundum	Fe²⁺Ti⁴⁺O₃	2	218950,218957	5433
Laumontite ()*	Not in a structural group	CaAl₂Si₄O₁₂·4H₂O	1	218936	1271
Lizardite ()*	Serpentine Clay	Mg₃Si₂O₅(OH)₄	1	218957	359
Magnesio-hornblende ()*	Amphibole	Ca₂(Mg₄Al)(Si₇Al)O₂₂(OH)₂	1	218957	238
Magnesiochromite ()*	Spinel	MgCr₂O₄	1	218942	311
Magnesite ()*	Calcite	Mg(CO₃)	3	218940,218942,218957	1487
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄	4	218940,218949,218950,218957	14899
Malachite ()*	Malachite	Cu₂(CO₃)(OH)₂	4	218943,218950,218957,218969	12537
Mcguinnessite ()*	Malachite	CuMg(CO₃)(OH)₂	1	218957	34
Microcline ()*	Feldspar	K(AlSi₃O₈)	1	218968	4924
Millerite ()*	Millerite	NiS	1	218957	1066
Molybdenite ()*	Molybdenite	MoS₂	1	218957	5800
Muscovite ()*	Mica Clay	KAl₂(Si₃Al)O₁₀(OH)₂	5	218937,218942,218951,218968,218969	17380
Nimite ()*	Chlorite Clay	(Ni,Mg,Al)₆(Si,Al)₄O₁₀(OH)₈	1	218957	15
Omphacite ()*	Pyroxene	(Ca,Na)(Mg,Fe,Al)Si₂O₆	1	218957	229
Opal ()*	Amorphous	SiO₂·nH₂O	2	218957,218969	2994
Pargasite ()*	Amphibole	NaCa₂(Mg₄Al)(Si₆Al₂)O₂₂(OH)₂	1	218957	313
Pentlandite ()*	Pentlandite	(Ni,Fe)₉S₈	1	218957	1512
Pokrovskite ()*	Malachite	Mg₂(CO₃)(OH)₂	1	218957	9
Prehnite ()*	Prehnite	Ca₂Al(Si₃Al)O₁₀(OH)₂	2	218936,218957	1898
Pyrite ()*	Pyrite	FeS₂	11	218930,218934,218949,218950,218951,218952,218953,218956,218957,218959,218969	39462
Pyrolusite ()*	Rutile	MnO₂	0		3106
Pyrrhotite ()*	Nickeline	Fe₇S₈	2	218950,218957	9056
Quartz ()*	Quartz	SiO₂	14	218923,218931,218932,218934,218949,218950,218951,218952,218953,218956,218957,218959,218968,218969	61156
Rutile ()*	Rutile	TiO₂	2	218942,218957	5614
Schorl ()*	Tourmaline	NaFe²⁺₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)	5	218937,218950,218956,218959,218968	2705
Siderite ()*	Calcite	Fe(CO₃)	1	218940	6417
Silver ()*	Copper	Ag	1	218950	5186
Spessartine ()*	Garnet	Mn²⁺₃Al₂(SiO₄)₃	1	218928	1214
Sphalerite ()*	Sphalerite	ZnS	1	218950	21482
Staurolite ()*	Staurolite	Fe²⁺₂Al₉Si₄O₂₃(OH)	1	218959	978
Talc ()*	Clay Talc	Mg₃Si₄O₁₀(OH)₂	6	218940,218942,218943,218950,218956,218957	3337
Tetradymite ()*	Tetradymite	Bi₂Te₂S	1	218949	510
Titanite ()*	Titanite	CaTi(SiO₄)O	2	218950,218957	4899
Tochilinite ()*	Tochilinite	6(Fe_0.9S)·5[(Mg,Fe)(OH)₂]	1	218957	56
Torbernite ()*	None	Cu(UO₂)₂(PO₄)₂·12H₂O	1	218969	1059
Tremolite ()*	Amphibole	Ca₂(Mg_5.0-4.5Fe²⁺_0.0-0.5)Si₈O₂₂(OH)₂	1	218957	2562
Uraninite ()*	Fluorite	UO₂	1	218969	2718
Vesuvianite ()*	Vesuvianite	(Ca,Na)₁₉(Al,Mg,Fe)₁₃(SiO₄)₁₀(Si₂O₇)₄(OH,F,O)₁₀	1	218957	1395
Xonotlite ()*	None	Ca₆Si₆O₁₇(OH)₂	1	218957	109
Zoisite ()*	Epidote	Ca₂Al₃[Si₂O₇][SiO₄]O(OH)	2	218950,218957	1025

No ages have been assigned to this locality yet.

Sample	Source Locality	Reference URL
R110197	Hunting Hill Quarry (Rockville Crushed Stone Quarry; Travilah Quarry; Rockville Quarry; Bardon Stone Quarry; Aggregate Industries Quarry), Rockville, Montgomery Co., Maryland, USA	https://rruff.info/R110197

All locality data graciously provided by mindat.org

All age data...