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:
Duncan, Ash Peak District (Twin Peaks District), Greenlee Co., Arizona, USA

mindat Locality ID: 47187
mindat URL: http://www.mindat.org/loc-47187.html

Tectonic Settings:

Total number of sublocalities beneath "Duncan, Ash Peak District (Twin Peaks District), Greenlee Co., Arizona, USA": 4
Total number of bottom-level sublocalities: 4

Number of Child Localities: 4
Child Localities:
Ash Peak Mines (Hardy Mine; Goldfield Extension Mine; Commerce And Shamrock Mine; Shamrock Shaft; Ash Peak Extension Mine; Patented Claim MS 3076a)
Duncan Area
Fourth Of July Mine (Fourth Of July Claims; Ellis Shaft; Billingsley Fluorspar Mines; Sydney Mine)
State Route 75 Opal Locality

Latitude: 32°48'42"N
Longitude: 109°10'"W
Decimal Degree (lat, lon): 32.811666666667,-109.16666666667

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.

Acanthite	Amorphous	Calcite	Fluorite	Harmotome	None	Not in a structural group	Pyrite	Quartz	Rocksalt

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: Ag Al Ba Be C Ca F Fe H Mn O Pb S Si

Elements from minerals reported directly at this locality:

Structural Groups for minerals in this locality:
Acanthite Amorphous Calcite Fluorite Harmotome None Not in a structural group Pyrite Quartz Rocksalt

11 IMA Minerals at location:

Acanthite ()*	Aurorite ()*	Bertrandite ()*	Calcite ()*	Fluorite ()*
Galena ()*	Harmotome ()*	Opal ()*	Pyrite ()*	Quartz ()*
Rhodochrosite ()*

Mineral name	Structural Groups	IMA Formula	# of Sublocalities containing mineral	LOCALITY IDs, not mindat ids	# of localities containing mineral
Acanthite ()*	Acanthite	Ag₂S	1	139652	2793
Aurorite ()*	None	Mn²⁺Mn⁴⁺₃O₇·3H₂O	1	139652	22
Bertrandite ()*	Not in a structural group	Be₄Si₂O₇(OH)₂	1	139654	606
Calcite ()*	Calcite	Ca(CO₃)	2	139652,139654	27770
Fluorite ()*	Fluorite	CaF₂	1	139654	9617
Galena ()*	Rocksalt	PbS	1	139652	24243
Harmotome ()*	Harmotome	Ba₂(Si₁₂Al₄)O₃₂·12H₂O	1	139653	290
Opal ()*	Amorphous	SiO₂·nH₂O	1	139655	2994
Pyrite ()*	Pyrite	FeS₂	1	139652	39462
Quartz ()*	Quartz	SiO₂	1	139655	61156
Rhodochrosite ()*	Calcite	Mn(CO₃)	1	139652	1711

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...