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:
Great Western-Mirabel Group, Middletown, East Mayacmas District, Mayacmas Mts (Mayacamas Mts), Lake Co., California, USA

Oldest recorded age at locality: 164
Youngest recorded age at locality: 0

mindat Locality ID: 217015
mindat URL: http://www.mindat.org/loc-217015.html

Tectonic Settings:

Total number of sublocalities beneath "Great Western-Mirabel Group, Middletown, East Mayacmas District, Mayacmas Mts (Mayacamas Mts), Lake Co., California, USA": 1
Total number of bottom-level sublocalities: 1

Number of Child Localities: 1
Child Localities:
Great Western Mine (Laguna Western; Black Bart Mine; Tucker Lease)

Latitude: 38°42'48"N
Longitude: 122°38'33"W
Decimal Degree (lat, lon): 38.713333333333,-122.6425

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	Calcite	Millerite	None	Pyrite	Quartz	Sphalerite	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: C Ca Cr Fe H Hg Mg Ni O Pb S Sb Se Si

Elements from minerals reported directly at this locality:

Structural Groups for minerals in this locality:
Amorphous Calcite Millerite None Pyrite Quartz Sphalerite Spinel

13 IMA Minerals at location:

Calcite ()*	Chromite ()*	Cinnabar ()*	Dolomite ()*	Idrialite ()*
Jamesonite ()*	Mercury ()*	Metacinnabar ()*	Millerite ()*	Opal ()*
Pyrite ()*	Quartz ()*	Tiemannite ()*

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)	164	164	1	160720	27770
Chromite ()*	Spinel	Fe²⁺Cr₂O₄	164	164	1	160720	3902
Cinnabar ()*	None	HgS	164	164	1	160720	2600
Dolomite ()*	None	CaMg(CO₃)₂	164	164	1	160720	9895
Idrialite ()*	None	C₂₂H₁₄	164	164	1	160720	15
Jamesonite ()*	None	Pb₄FeSb₆S₁₄	164	164	1	160720	784
Mercury ()*	None	Hg	164	164	1	160720	397
Metacinnabar ()*	Sphalerite	HgS	164	164	1	160720	255
Millerite ()*	Millerite	NiS	164	164	1	160720	1066
Opal ()*	Amorphous	SiO₂·nH₂O	164	164	1	160720	2994
Pyrite ()*	Pyrite	FeS₂	164	164	1	160720	39462
Quartz ()*	Quartz	SiO₂	164	164	1	160720	61156
Tiemannite ()*	Sphalerite	HgSe	164	164	1	160720	83

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
	podchrome-00323	164	164	Middle Jurassic (161-168 Ma)										Cr	80774	Great Western Mine (Laguna Western; Black Bart Mine; Tucker Lease), Great Western-Mirabel Group, Middletown, East Mayacmas District, Mayacmas Mts (Mayacamas Mts), Lake Co., California, USA	Black Bart	Moiser et al. (2012)		USGSSIR2012_5157

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...