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:
Knoxville District, Napa Co., California, USA

Oldest recorded age at locality: 164
Youngest recorded age at locality: 164

mindat Locality ID: 218167
mindat URL: http://www.mindat.org/loc-218167.html

Tectonic Settings:

Total number of sublocalities beneath "Knoxville District, Napa Co., California, USA": 20
Total number of bottom-level sublocalities: 19

Number of Child Localities: 1
Child Localities:
Knoxville

Latitude: 38°48'42"N
Longitude: 122°21'17"W
Decimal Degree (lat, lon): 38.811666666667,-122.35472222222

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.

Alunite	Amarantite	Amorphous	Aragonite	Arsenolite	Arsenopyrite	Baryte	Botryogen	Calcite	Clay
Copiapite	Copper	Coquimbite	Epsomite	Feldspar	Halotrichite	Kaolinite	Marcasite	Melanterite	Mica
Millerite	None	Not in a structural group	Pyrite	Quartz	Rutile	Smectite-vermiculite	Sphalerite	Spinel	Stibnite
Sulphur	Voltaite

Alunogen ()*	Ammonioalunite ()*	Aragonite ()*	Arsenopyrite ()*	Baryte ()*
Botryogen ()*	Buddingtonite ()*	Calcite ()*	Calomel ()*	Chromite ()*
Cinnabar ()*	Copiapite ()*	Coquimbite ()*	Epsomite ()*	Fibroferrite ()*
Gold ()*	Hohmannite ()*	Idrialite ()*	Jamesonite ()*	Kaolinite ()*
Magnesiocopiapite ()*	Magnesite ()*	Marcasite ()*	Melanterite ()*	Mercury ()*
Metacinnabar ()*	Miargyrite ()*	Millerite ()*	Mirabilite ()*	Montmorillonite ()*
Montroydite ()*	Muscovite ()*	Opal ()*	Pyrargyrite ()*	Pyrite ()*
Pyrolusite ()*	Quartz ()*	Redingtonite ()*	Senarmontite ()*	Siderite ()*
Stibnite ()*	Sulphur ()*	Voltaite ()*

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 Ba C Ca Cl Cr Fe H Hg K Mg Mn N Na Ni O Pb S Sb Si

Elements from minerals reported directly at this locality:

Structural Groups for minerals in this locality:
Alunite Amarantite Amorphous Aragonite Arsenolite Arsenopyrite Baryte Botryogen Calcite Clay
Copiapite Copper Coquimbite Epsomite Feldspar Halotrichite Kaolinite Marcasite Melanterite Mica
Millerite None Not in a structural group Pyrite Quartz Rutile Smectite-vermiculite Sphalerite Spinel Stibnite
Sulphur Voltaite

43 IMA Minerals at location:

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
Alunogen ()*	Not in a structural group	Al₂(SO₄)₃(H₂O)₁₂·5H₂O			1	164952	272
Ammonioalunite ()*	Alunite	(NH₄)Al₃(SO₄)₂(OH)₆			1	164952	11
Aragonite ()*	Aragonite	Ca(CO₃)			1	164952	3250
Arsenopyrite ()*	Arsenopyrite	FeAsS			2	164952,164956	9052
Baryte ()*	Baryte	Ba(SO₄)			1	164952	11547
Botryogen ()*	Botryogen	MgFe³⁺(SO₄)₂(OH)·7H₂O			1	164956	45
Buddingtonite ()*	Feldspar	(NH₄)(AlSi₃)O₈			1	164952	27
Calcite ()*	Calcite	Ca(CO₃)			1	164952	27770
Calomel ()*	None	HgCl			1	164956	91
Chromite ()*	Spinel	Fe²⁺Cr₂O₄	164	164	8	164950,164953,164954,164956,164957,164961,164962,164963	3902
Cinnabar ()*	None	HgS			4	164949,164952,164955,164956	2600
Copiapite ()*	Copiapite	Fe²⁺Fe³⁺₄(SO₄)₆(OH)₂·20H₂O			1	164956	382
Coquimbite ()*	Coquimbite	AlFe₃(SO₄)₆(H₂O)₁₂·6H₂O			1	164956	136
Epsomite ()*	Epsomite	Mg(SO₄)·7H₂O			1	164956	484
Fibroferrite ()*	Not in a structural group	Fe³⁺(SO₄)(OH)·5H₂O			1	164956	107
Gold ()*	Copper	Au			1	164952	30554
Hohmannite ()*	Amarantite	Fe³⁺₂O(SO₄)₂·8H₂O			1	164956	10
Idrialite ()*	None	C₂₂H₁₄			1	164956	15
Jamesonite ()*	None	Pb₄FeSb₆S₁₄			1	164952	784
Kaolinite ()*	Clay Kaolinite	Al₂Si₂O₅(OH)₄			1	164952	5591
Magnesiocopiapite ()*	Copiapite	MgFe³⁺₄(SO₄)₆(OH)₂·20H₂O			1	164956	54
Magnesite ()*	Calcite	Mg(CO₃)			1	164956	1487
Marcasite ()*	Marcasite	FeS₂			2	164952,164956	5674
Melanterite ()*	Melanterite	Fe(SO₄)·7H₂O			2	164952,164956	915
Mercury ()*	None	Hg			1	164952	397
Metacinnabar ()*	Sphalerite	HgS			2	164952,164956	255
Miargyrite ()*	None	AgSbS₂			1	164952	300
Millerite ()*	Millerite	NiS			1	164949	1066
Mirabilite ()*	None	Na₂(SO₄)·10H₂O			1	164956	223
Montmorillonite ()*	Clay Smectite-vermiculite	(Na,Ca)_0.3(Al,Mg)₂Si₄O₁₀(OH)₂·nH₂O			1	164952	1508
Montroydite ()*	None	HgO			1	164952	29
Muscovite ()*	Mica Clay	KAl₂(Si₃Al)O₁₀(OH)₂			1	164952	17380
Opal ()*	Amorphous	SiO₂·nH₂O			3	164948,164952,164956	2994
Pyrargyrite ()*	None	Ag₃SbS₃			1	164952	1425
Pyrite ()*	Pyrite	FeS₂			1	164952	39462
Pyrolusite ()*	Rutile	MnO₂			2	164952,164956	3106
Quartz ()*	Quartz	SiO₂			2	164952,164956	61156
Redingtonite ()*	Halotrichite	Fe²⁺Cr₂(SO₄)₄·22H₂O			1	164956	2
Senarmontite ()*	Arsenolite	Sb₂O₃			1	164952	179
Siderite ()*	Calcite	Fe(CO₃)			1	164956	6417
Stibnite ()*	Stibnite	Sb₂S₃			2	164952,164956	3418
Sulphur ()*	Sulphur	S			1	164956	2045
Voltaite ()*	Voltaite	K₂Fe²⁺₅Fe³⁺₃Al(SO₄)₁₂·18H₂O			1	164956	111

4 Ages assigned to this locality:

Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Age applies to these Elements	MinDat Locality ID	Dated Locality (Max Age)	Location as listed in reference	Reference	Reference ID
podchrome-00330	164	164	Middle Jurassic (161-168 Ma)	Cr	83666	Grey Claim (Grey Mine), Knoxville, Knoxville District, Napa Co., California, USA	Grey Claim	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00331	164	164	Middle Jurassic (161-168 Ma)	Cr	83684	Moore Mine (Marshall And Vanderbilt Claims), Knoxville, Knoxville District, Napa Co., California, USA	Moore (Vanderbilt Claim)	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00332	164	164	Middle Jurassic (161-168 Ma)	Cr	83684	Moore Mine (Marshall And Vanderbilt Claims), Knoxville, Knoxville District, Napa Co., California, USA	Moore (Marshall Claim)	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00333	164	164	Middle Jurassic (161-168 Ma)	Cr	83687	Mullaly Mine, Knoxville, Knoxville District, Napa Co., California, USA	Mullaly	Moiser et al. (2012)	USGSSIR2012_5157

Sample	Source Locality	Reference URL
R070581	Redington Mine (Boston Mine; Knoxville Mine; Excellsior Mine), Knoxville, Knoxville District, Napa Co., California, USA	https://rruff.info/R070581

All locality data graciously provided by mindat.org

All age data...