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

Oldest recorded age at locality: 2.9
Youngest recorded age at locality: 0

mindat Locality ID: 220769
mindat URL: http://www.mindat.org/loc-220769.html

Tectonic Settings:

Total number of sublocalities beneath "Cobb, East Mayacmas District, Mayacmas Mts (Mayacamas Mts), Lake Co., California, USA": 13
Total number of bottom-level sublocalities: 12

Number of Child Localities: 10
Child Localities:
Anderson Springs Mine
Black Point Claim
Cobb Mountain Oyster Rock
Gordon Springs Deposits
Herrick Prospect
Kims Yard II (Anderson Springs Pit)
Seigler Springs
Unnamed Cr Occurrence (6)
Whispering Pines Prospect
Wispering Pines Occurrence

Latitude: 38°48'20"N
Longitude: 122°42'45"W
Decimal Degree (lat, lon): 38.805555555556,-122.7125

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	None	Pyrite	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: B C Ca Cr Fe H Hg Mg O S

Elements from minerals reported directly at this locality:

Structural Groups for minerals in this locality:
Calcite None Pyrite Spinel

6 IMA Minerals at location:

Calcite ()*	Chromite ()*	Cinnabar ()*	Magnesiochromite ()*	Pyrite ()*
Sassolite ()*

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)	2.9	0	1	160668	27770
Chromite ()*	Spinel	Fe²⁺Cr₂O₄	2.9	1.03	3	160671,160675,160678	3902
Cinnabar ()*	None	HgS	2.9	0	1	160668	2600
Magnesiochromite ()*	Spinel	MgCr₂O₄	2.9	0	1	160679	311
Pyrite ()*	Pyrite	FeS₂	2.9	0	1	160668	39462
Sassolite ()*	None	B(OH)₃	2.9	0	1	160674	31

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
	Hg-00110	2.9	0		?-?						Yes		Cinnabar, Mercury, Metacinnabar, Schuetteite, Tiemannite	Hg	80795	East Mayacmas District, Mayacmas Mts (Mayacamas Mts), Lake Co., California, USA		Smith et al. (2008)	10.1016/j.epsl.2008.02.029	EPSL269_399
	NAVDAT-130378	1.07	1.03	1.05±0.02					130378						80901	Unnamed Cr Occurrence (6), Cobb, East Mayacmas District, Mayacmas Mts (Mayacamas Mts), Lake Co., California, USA		NAVDAT		NAVDAT

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...