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 Area, Napa Co., California, USA

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

mindat Locality ID: 228065
mindat URL: http://www.mindat.org/loc-228065.html

Tectonic Settings:

Total number of sublocalities beneath "Knoxville Area, Napa Co., California, USA": 13
Total number of bottom-level sublocalities: 13

Number of Child Localities: 13
Child Localities:
Adams And Westendorf Claims
Black Hawk Claim
Blue Monday Claim (Surpise; Searchlight)
Cigarette Mine
Dollerhyde Claim
Ferris Claim
Graves Mine
Hightower Claim
Lone Pine Mine
Nevada Claim
Turner Mine
Unnamed Cr Occurrence (3)
Unnamed Cr Prospect (16)

Latitude: 38°45'57"N
Longitude: 122°21'24"W
Decimal Degree (lat, lon): 38.765833333333,-122.35666666667

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	None	Quartz	Spinel

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: Cr Fe H O Si

Elements from minerals reported directly at this locality:

Structural Groups for minerals in this locality:
Amorphous None Quartz Spinel

3 IMA Minerals at location:

Chromite ()*	Opal ()*	Quartz ()*

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
Chromite ()*	Spinel	Fe²⁺Cr₂O₄	164	164	9	164935,164937,164938,164939,164941,164942,164943,164944,164945	3902
Opal ()*	Amorphous	SiO₂·nH₂O			1	164934	2994
Quartz ()*	Quartz	SiO₂			1	164942	61156

1 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
	podchrome-00334	164	164	Middle Jurassic (161-168 Ma)										Cr	83721	Turner Mine, Knoxville Area, Napa Co., California, USA	Turner	Moiser et al. (2012)		USGSSIR2012_5157

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...