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:
East Mayacmas District, Mayacmas Mts (Mayacamas Mts), Napa Co., California, USA

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

mindat Locality ID: 209461
mindat URL: http://www.mindat.org/loc-209461.html

Tectonic Settings:

Total number of sublocalities beneath "East Mayacmas District, Mayacmas Mts (Mayacamas Mts), Napa Co., California, USA": 59
Total number of bottom-level sublocalities: 53

Number of Child Localities: 4
Child Localities:
Aetna Springs
Detert Reservoir Area
Middletown Area
Pope Valley

Latitude: 38°40'37"N
Longitude: 122°26'46"W
Decimal Degree (lat, lon): 38.676944444444,-122.44611111111

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.

Calcite	Clay	Cristobalite	Epsomite	Kaolinite	Millerite	None	Pyrite	Quartz	Sphalerite
Spinel	Sulphur

Calcite ()*	Calomel ()*	Chromite ()*	Cinnabar ()*	Cristobalite ()*
Epsomite ()*	Kaolinite ()*	Magnesiochromite ()*	Magnesite ()*	Mercury ()*
Metacinnabar ()*	Millerite ()*	Morenosite ()*	Pyrite ()*	Quartz ()*
Sulphur ()*

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 C Ca Cl Cr Fe H Hg Mg Ni O S Si

Elements from minerals reported directly at this locality:

Structural Groups for minerals in this locality:
Calcite Clay Cristobalite Epsomite Kaolinite Millerite None Pyrite Quartz Sphalerite
Spinel Sulphur

16 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
Calcite ()*	Calcite	Ca(CO₃)			2	165033,165039	27770
Calomel ()*	None	HgCl			1	165040	91
Chromite ()*	Spinel	Fe²⁺Cr₂O₄	164	164	15	165027,165028,165029,165031,165032,165045,165048,165059,165061,165065,165069,165070,165071,165072,165073	3902
Cinnabar ()*	None	HgS			11	165026,165030,165033,165036,165039,165040,165041,165055,165056,165066,165079	2600
Cristobalite ()*	Cristobalite	SiO₂			1	165079	453
Epsomite ()*	Epsomite	Mg(SO₄)·7H₂O			1	165040	484
Kaolinite ()*	Clay Kaolinite	Al₂Si₂O₅(OH)₄			2	165039,165040	5591
Magnesiochromite ()*	Spinel	MgCr₂O₄			1	165081	311
Magnesite ()*	Calcite	Mg(CO₃)			1	165082	1487
Mercury ()*	None	Hg			2	165026,165040	397
Metacinnabar ()*	Sphalerite	HgS			2	165026,165040	255
Millerite ()*	Millerite	NiS			3	165026,165040,165066	1066
Morenosite ()*	Epsomite	Ni(SO₄)·7H₂O			1	165066	84
Pyrite ()*	Pyrite	FeS₂			5	165026,165033,165039,165040,165066	39462
Quartz ()*	Quartz	SiO₂			2	165033,165039	61156
Sulphur ()*	Sulphur	S			1	165040	2045

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
	podchrome-00335	164	164	Middle Jurassic (161-168 Ma)										Cr	83637	Astute Mine, Aetna Springs, East Mayacmas District, Mayacmas Mts (Mayacamas Mts), Napa Co., California, USA	Astute	Moiser et al. (2012)		USGSSIR2012_5157
	podchrome-00337	164	164	Middle Jurassic (161-168 Ma)										Cr	83656	Elder Claim, Pope Valley, East Mayacmas District, Mayacmas Mts (Mayacamas Mts), Napa Co., California, USA	Elder Claim	Moiser et al. (2012)		USGSSIR2012_5157

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...