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

mindat Locality ID: 83722
mindat URL: http://www.mindat.org/loc-83722.html

Tectonic Settings:

Total number of sublocalities beneath "Twin Peaks Mine, Twin Peaks, Calistoga, Calistoga District (Silverado District), Mayacmas Mts (Mayacamas Mts), Napa Co., California, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 38°39'45"N
Longitude: 122°32'2"W
Decimal Degree (lat, lon): 38.6625,-122.53388888889

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.

Clay	Millerite	None	Smectite-vermiculite	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: Al Ca Cr Fe H Hg Mg Na Ni O S Si

Elements from minerals reported directly at this locality: Al Ca Cr Fe H Hg Mg Na Ni O S Si

Structural Groups for minerals in this locality:
Clay Millerite None Smectite-vermiculite Spinel

4 IMA Minerals at location:

Chromite ()*	Cinnabar ()*	Millerite ()*	Saponite ()*

Mineral name	Structural Groups	IMA Formula	# of localities containing mineral
Chromite ()*	Spinel	Fe²⁺Cr₂O₄	3902
Cinnabar ()*	None	HgS	2600
Millerite ()*	Millerite	NiS	1066
Saponite ()*	Clay Smectite-vermiculite	(Ca,Na)_0.3(Mg,Fe)₃(Si,Al)₄O₁₀(OH)₂·4H₂O	301

No ages have been assigned to this locality yet.

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...