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:
Twin Peaks, Calistoga, Calistoga District (Silverado District), Mayacmas Mts (Mayacamas Mts), Napa Co., California, USA


mindat Locality ID: 220112
mindat URL: http://www.mindat.org/loc-220112.html

Tectonic Settings:

Total number of sublocalities beneath "Twin Peaks, Calistoga, Calistoga District (Silverado District), Mayacmas Mts (Mayacamas Mts), Napa Co., California, USA": 3
Total number of bottom-level sublocalities: 3

Number of Child Localities: 3
Child Localities:
Corona Mines (Vallejo Mines)
Twin Peaks Mine
Unnamed Ag Occurrence (1)

Latitude: 38°39'14"N
Longitude: 122°33'7"W
Decimal Degree (lat, lon): 38.653888888889,-122.55194444444
AThis mineral is Anthropogenic.
GThis mineral is directly dated.
BThis mineral is reported as having this age.
YThis mineral is using an age reported as an element mineralization period.
OThis mineral is using an age calculated from all data at the locality.
RThe age displayed for this mineral originates from a different, non-child locality.
PThe 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.

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 Cr Fe H Hg Mg Na Ni O S Si 

Elements from minerals reported directly at this locality: 

Structural Groups for minerals in this locality: 
AmorphousClayCoquimbiteMarcasiteMelanteriteMilleriteNonePyriteRömeriteSmectite-vermiculite
SphaleriteSpinelStarkeyite

14 IMA Minerals at location:
Chromite  (*)Cinnabar  (*)Coquimbite  (*)Dolomite  (*)Marcasite  (*)
Melanterite  (*)Mercury  (*)Metacinnabar  (*)Millerite  (*)Opal  (*)
Pyrite  (*)Römerite  (*)Rozenite  (*)Saponite  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Chromite  (*)SpinelFe2+Cr2O411650033902
Cinnabar  (*)NoneHgS2165002,1650032600
Coquimbite  (*)CoquimbiteAlFe3(SO4)6(H2O)12·6H2O1165002136
Dolomite  (*)NoneCaMg(CO3)211650029895
Marcasite  (*)MarcasiteFeS211650025674
Melanterite  (*)MelanteriteFe(SO4)·7H2O1165002915
Mercury  (*)NoneHg1165002397
Metacinnabar  (*)SphaleriteHgS1165002255
Millerite  (*)MilleriteNiS11650031066
Opal  (*)AmorphousSiO2·nH2O11650022994
Pyrite  (*)PyriteFeS2116500239462
Römerite  (*)RömeriteFe2+Fe3+2(SO4)4·14H2O1165002115
Rozenite  (*)StarkeyiteFe2+(SO4)·4H2O1165002293
Saponite  (*)Clay Smectite-vermiculite(Ca,Na)0.3(Mg,Fe)3(Si,Al)4O10(OH)2·4H2O1165003301


No ages have been assigned to this locality yet.
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All locality data graciously provided by mindat.org

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