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:
Fairfax Co., Virginia, USA

Oldest recorded age at locality: 508
Youngest recorded age at locality: 220

mindat Locality ID: 4204
mindat URL: http://www.mindat.org/loc-4204.html

Tectonic Settings:

Total number of sublocalities beneath "Fairfax Co., Virginia, USA": 56
Total number of bottom-level sublocalities: 45

Number of Child Localities: 37
Child Localities:
Annandale
Bull Run Occurrence
Chantilly
Clay Deposit (MRDS - 10067944)
Clifton
Copper Crossing Prospect
Culpeper Basin
Difficult Run
Doctors Run
Dranesville
Fairfax
Fairfax Courthouse
Falls Church
Fourmile Run
Gold-Pyrite Belt
Graham-Virginia Granite Quarry (Mideast Div. Vulcan Materials Company)
Great Falls
Greenbriar
Herndon
Hise Prospect
Jenkins Farm Prospect
Lorton
Manassas Quarry
Mineral Ridge
Occoquan Quarry (Occoquan Quarry Nos. 1 & 2)
Pimmet Run
Potomac River
Quantico Slate Deposits
Schist Prospect (MRDS - 10067952)
Shale Prospect (MRDS - 10067948)
Shale Prospect (MRDS - 10067949)
Shale Prospect (MRDS - 10067951)
Sisson
Tenley
Unnamed Amphibolite
Unnamed Specularite Occurrence (MRDS - 10130606)
Wiehle

Latitude: 38°50'53"N
Longitude: 77°20'48"W
Decimal Degree (lat, lon): 38.848055555556,-77.346666666667

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.

Acanthite	Allophane	Amorphous	Amphibole	Analcime	Andalusite	Apatite	Apophyllite	Baryte	Beryl
Brochantite	Calcite	Chabazite	Chalcanthite	Chalcopyrite	Clay	Clinozoisite	Copper	Corundum	Epidote
Ettringite	Feldspar	Gadolinite	Garnet	Gyrolite	Heulandite	Malachite	Melanterite	Mica	Mordenite
Natrolite	None	Not in a structural group	Pectolite	Prehnite	Pyrite	Pyroxene	Quartz	Rhodonite	Rocksalt
Rutile	Serpentine	Smectite-vermiculite	Sphalerite	Spinel	Stilbite	Sulphur	Talc	Titanite	Tourmaline
Wavellite	Wurtzite

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 Au B Ba Bi C Ca Cd Cl Cr Cu F Fe H K Li Mg Mn Na O P Pb S Si Ti Zn Zr

Elements from minerals reported directly at this locality: Al Fe H K Mg Mn O P S Si

Structural Groups for minerals in this locality:
Acanthite Allophane Amorphous Amphibole Analcime Andalusite Apatite Apophyllite Baryte Beryl
Brochantite Calcite Chabazite Chalcanthite Chalcopyrite Clay Clinozoisite Copper Corundum Epidote
Ettringite Feldspar Gadolinite Garnet Gyrolite Heulandite Malachite Melanterite Mica Mordenite
Natrolite None Not in a structural group Pectolite Prehnite Pyrite Pyroxene Quartz Rhodonite Rocksalt
Rutile Serpentine Smectite-vermiculite Sphalerite Spinel Stilbite Sulphur Talc Titanite Tourmaline
Wavellite Wurtzite

76 IMA Minerals at location:

Acanthite ()*	Actinolite ()*	Albite ()*	Analcime ()*	Andalusite ()*
Andradite ()*	Anhydrite ()*	Anorthite ()*	Anthophyllite ()*	Antigorite ()*
Azurite ()*	Babingtonite ()*	Baryte ()*	Bornite ()*	Brochantite ()*
Calcite ()*	Chabazite-Ca ()*	Chalcanthite ()*	Chalcocite ()*	Chalcopyrite ()*
Chlorapatite ()*	Chromite ()*	Chrysocolla ()*	Chrysotile ()*	Clinozoisite ()*
Cordierite ()*	Cuprobismutite ()*	Datolite ()*	Diopside ()*	Dravite ()*
Epidote ()*	Galena ()*	Gold ()*	Greenockite ()*	Gyrolite ()*
Hematite ()*	Heulandite-Ca ()*	Hydroxyapophyllite-(K) ()*	Ilmenite ()*	Kyanite ()*
Laumontite ()*	Libethenite ()*	Lithiophorite ()*	Loudounite ()*	Magnetite ()*
Malachite ()*	Melanterite ()*	Mesolite ()*	Microcline ()*	Montmorillonite ()*
Mordenite ()*	Muscovite ()*	Natrolite ()*	Okenite ()*	Opal ()*
Pectolite ()*	Prehnite ()*	Pseudomalachite ()*	Pyrite ()*	Pyrolusite ()*
Quartz ()*	Siderite ()*	Sillimanite ()*	Silver ()*	Sphalerite ()*
Stellerite ()*	Stilbite-Ca ()*	Sulphur ()*	Talc ()*	Thaumasite ()*
Titanite ()*	Tremolite ()*	Variscite ()*	Wavellite ()*	Wittichenite ()*
Wurtzite ()*

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of Sublocalities containing mineral	LOCALITY IDs, not mindat ids	# of localities containing mineral
Acanthite ()*	Acanthite	Ag₂S			1	280661	2793
Actinolite ()*	Amphibole	Ca₂(Mg_4.5-2.5Fe²⁺_0.5-2.5)Si₈O₂₂(OH)₂			2	280661,280662	3419
Albite ()*	Feldspar	Na(AlSi₃O₈)			1	280661	8803
Analcime ()*	Analcime	Na(AlSi₂O₆)·H₂O			1	280661	1627
Andalusite ()*	Andalusite	Al₂SiO₅			4	280667,280671,280701,280703	1310
Andradite ()*	Garnet	Ca₃Fe³⁺₂(SiO₄)₃			1	280661	1534
Anhydrite ()*	Not in a structural group	Ca(SO₄)			1	280661	1588
Anorthite ()*	Feldspar	Ca(Al₂Si₂O₈)			1	280661	1036
Anthophyllite ()*	Amphibole	Mg₂Mg₅Si₈O₂₂(OH)₂			1	280661	718
Antigorite ()*	Serpentine Clay	Mg₃Si₂O₅(OH)₄	508	220	0		708
Azurite ()*	Not in a structural group	Cu₃(CO₃)₂(OH)₂	220	220	2	280655,280686	5509
Babingtonite ()*	Rhodonite	Ca₂Fe²⁺Fe³⁺Si₅O₁₄(OH)			1	280661	161
Baryte ()*	Baryte	Ba(SO₄)			1	280664	11547
Bornite ()*	None	Cu₅FeS₄	220	220	3	280661,280663,280680	5516
Brochantite ()*	Brochantite	Cu₄(SO₄)(OH)₆	220	220	1	280655	1633
Calcite ()*	Calcite	Ca(CO₃)			4	280658,280660,280667,280691	27770
Chabazite-Ca ()*	Chabazite	Ca₂[Al₄Si₈O₂₄]·13H₂O			1	280691	310
Chalcanthite ()*	Chalcanthite	Cu(SO₄)·5H₂O	220	220	1	280661	925
Chalcocite ()*	None	Cu₂S	220	220	3	280661,280663,280666	5707
Chalcopyrite ()*	Chalcopyrite	CuFeS₂	220	220	5	280655,280661,280680,280686,280688	27198
Chlorapatite ()*	Apatite	Ca₅(PO₄)₃Cl			1	280661	203
Chromite ()*	Spinel	Fe²⁺Cr₂O₄			1	280669	3902
Chrysocolla ()*	Allophane	(Cu_2-xAl_x)H_2-xSi₂O₅(OH)₄·nH₂O	220	220	1	280686	3531
Chrysotile ()*	Serpentine Clay	Mg₃Si₂O₅(OH)₄			1	280688	951
Clinozoisite ()*	Clinozoisite Epidote	Ca₂Al₃[Si₂O₇][SiO₄]O(OH)			1	280661	1025
Cordierite ()*	Beryl	Mg₂Al₄Si₅O₁₈			1	280703	1008
Cuprobismutite ()*	None	Cu₈AgBi₁₃S₂₄	220	220	1	280661	43
Datolite ()*	Gadolinite	CaB(SiO₄)(OH)			1	280661	498
Diopside ()*	Pyroxene	CaMgSi₂O₆			1	280661	4135
Dravite ()*	Tourmaline	NaMg₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)			1	280660	648
Epidote ()*	Epidote Clinozoisite	Ca₂(Al₂Fe³⁺)[Si₂O₇][SiO₄]O(OH)			3	280661,280667,280686	8173
Galena ()*	Rocksalt	PbS			3	280661,280680,280692	24243
Gold ()*	Copper	Au			4	280653,280680,280692,280694	30554
Greenockite ()*	Wurtzite	CdS			1	280661	717
Gyrolite ()*	Gyrolite	NaCa₁₆(Si₂₃Al)O₆₀(OH)₈·14H₂O			1	280691	142
Hematite ()*	Corundum	Fe₂O₃			5	280661,280665,280667,280684,280686	14640
Heulandite-Ca ()*	Heulandite	(Ca,Na,K)₅(Si₂₇Al₉)O₇₂·26H₂O			1	280691	246
Hydroxyapophyllite-(K) ()*	Apophyllite	KCa₄Si₈O₂₀(OH,F)·8H₂O			1	280661	85
Ilmenite ()*	Corundum	Fe²⁺Ti⁴⁺O₃			1	280661	5433
Kyanite ()*	Not in a structural group	Al₂OSiO₄			1	280667	1507
Laumontite ()*	Not in a structural group	CaAl₂Si₄O₁₂·4H₂O			2	280661,280691	1271
Libethenite ()*	Andalusite	Cu₂(PO₄)(OH)	220	220	1	280686	234
Lithiophorite ()*	None	(Al,Li)(Mn⁴⁺,Mn³⁺)O₂(OH)₂			1	280673	210
Loudounite ()*	None	NaCa₅Zr₄Si₁₆O₄₀(OH)₁₁·8H₂O			1	280661	2
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄			5	280661,280667,280683,280688,280694	14899
Malachite ()*	Malachite	Cu₂(CO₃)(OH)₂	220	220	8	280655,280661,280664,280665,280666,280684,280686,280688	12537
Melanterite ()*	Melanterite	Fe(SO₄)·7H₂O	508	220	0		915
Mesolite ()*	Natrolite	Na₂Ca₂(Si₉Al₆)O₃₀·8H₂O			1	280661	425
Microcline ()*	Feldspar	K(AlSi₃O₈)	508	220	0		4924
Montmorillonite ()*	Clay Smectite-vermiculite	(Na,Ca)_0.3(Al,Mg)₂Si₄O₁₀(OH)₂·nH₂O			1	280660	1508
Mordenite ()*	Mordenite	(Na₂,Ca,K₂)₄(Al₈Si₄₀)O₉₆·28H₂O			1	280660	405
Muscovite ()*	Mica Clay	KAl₂(Si₃Al)O₁₀(OH)₂			1	280680	17380
Natrolite ()*	Natrolite	Na₂(Si₃Al₂)O₁₀·2H₂O			1	280661	1236
Okenite ()*	None	Ca₁₀Si₁₈O₄₆·18H₂O			1	280661	71
Opal ()*	Amorphous	SiO₂·nH₂O			1	280660	2994
Pectolite ()*	Pectolite	NaCa₂Si₃O₈(OH)			1	280661	363
Prehnite ()*	Prehnite	Ca₂Al(Si₃Al)O₁₀(OH)₂			3	280660,280661,280691	1898
Pseudomalachite ()*	None	Cu₅(PO₄)₂(OH)₄	220	220	1	280686	369
Pyrite ()*	Pyrite	FeS₂			9	280660,280664,280667,280676,280680,280682,280688,280691,280694	39462
Pyrolusite ()*	Rutile	MnO₂	508	220	0		3106
Quartz ()*	Quartz	SiO₂			15	280652,280660,280661,280667,280668,280670,280672,280675,280676,280677,280680,280686,280692,280694,280697	61156
Siderite ()*	Calcite	Fe(CO₃)			1	280680	6417
Sillimanite ()*	Not in a structural group	Al₂SiO₅			1	280667	1516
Silver ()*	Copper	Ag			1	280661	5186
Sphalerite ()*	Sphalerite	ZnS			1	280661	21482
Stellerite ()*	Stilbite	Ca₄(Si₂₈Al₈)O₇₂·28H₂O			1	280661	189
Stilbite-Ca ()*	Stilbite	NaCa₄(Si₂₇Al₉)O₇₂·28H₂O			1	280691	268
Sulphur ()*	Sulphur	S			2	280676,280695	2045
Talc ()*	Clay Talc	Mg₃Si₄O₁₀(OH)₂			7	280650,280657,280673,280680,280688,280702,280705	3337
Thaumasite ()*	Ettringite	Ca₃Si(OH)₆(CO₃)(SO₄)·12H₂O			2	280660,280661	183
Titanite ()*	Titanite	CaTi(SiO₄)O			1	280661	4899
Tremolite ()*	Amphibole	Ca₂(Mg_5.0-4.5Fe²⁺_0.0-0.5)Si₈O₂₂(OH)₂			1	280662	2562
Variscite ()*	None	Al(PO₄)·2H₂O	508	220	0		301
Wavellite ()*	Wavellite	Al₃(PO₄)₂(OH)₃·5H₂O	508	220	0		374
Wittichenite ()*	None	Cu₃BiS₃	220	220	1	280661	297
Wurtzite ()*	Wurtzite	ZnS			1	280661	372

2 Ages assigned to this locality:

	Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Age Interpret	Prioritized?	Sample Source	Sample Num	Run Num	Age from other Locality	Dated Mineral	Minerals explicitely stated as having this age	Age applies to these Elements	MinDat Locality ID	Dated Locality (Max Age)	Location as listed in reference	Reference	Reference DOI	Reference ID	Age Notes
	sedcu-00678	220	220	Triassic										Cu	4204	Fairfax Co., Virginia, USA	Chantilly	Cox et al. (2003)		USGSOFR03_107
	USGS-Rb-Sr-06521	508	480	494±14	Rb-Sr	age of intrusion		whole rock							103563	Graham-Virginia Granite Quarry (Mideast Div. Vulcan Materials Company), Fairfax Co., Virginia, USA		USGS-Rb-Sr		USGS-Rb-Sr

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...