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While externally similar shapes, these two minerals are very different inside.
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Tetrahedrite Subgroup from
Mildren Mine (Mildren claim; Mildred Mine), Mildren Mine group, Ko Vaya, Cababi Mining District (Comobabi Mining District), Comobabi Mountains, Pima County, Arizona, USA


Locality type:Mine
Classification
Species:'Tetrahedrite Subgroup' (not an IMA approved species)
Formula:Cu6(Cu4C22+)Sb4S12S
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Tetrahedrite Subgroup data
Locality Data:Click here to view Mildren Mine (Mildren claim; Mildred Mine), Mildren Mine group, Ko Vaya, Cababi Mining District (Comobabi Mining District), Comobabi Mountains, Pima County, Arizona, USA
Data Identifiers
Mindat Occurrence Record ID:537871
Long-form Identifier:1:3:537871:5
GUID (UUID V4):0
Nearest other occurrences of Tetrahedrite Subgroup
0.2km (0.1 miles) ⓘMildren Mine group, Ko Vaya, Cababi Mining District (Comobabi Mining District), Comobabi Mountains, Pima County, Arizona, USA
2.9km (1.8 miles) ⓘSteppe Mine (Steppe claim; Little Mary Mine), Mildren Mine group, Ko Vaya, Cababi Mining District (Comobabi Mining District), Comobabi Mountains, Pima County, Arizona, USA
39.4km (24.5 miles) ⓘRoadside Mine (St. Francis Mine; Coyote claim), Pan Tak, Coyote Mining District, Coyote Mountains, Pima County, Arizona, USA
63.0km (39.2 miles) ⓘBanner Mine group (Banner Mine; Hughes Mine), Stevens Mountain, Papago Mining District (Sierrita Mining District), Sierrita Mountains, Pima County, Arizona, USA
63.5km (39.4 miles) ⓘReward Mine (Bat tunnel; South Reward; Petrochis claim; Phenomenon), Kohatk, Vekol Mining District, Vekol Mountains, Pinal County, Arizona, USA
65.0km (40.4 miles) ⓘSunrise and Sunshine Mines (Sunshine-Sunrise group of claims; Sunshine group; Malone group), Papago Mining District (Sierrita Mining District), Sierrita Mountains, Pima County, Arizona, USA
65.3km (40.6 miles) ⓘSunshine Mine, Sierrita Mountains, Pima County, Arizona, USA
68.0km (42.2 miles) ⓘNorth Opening, Silver Hill Mine (Gold Coin Mine), Cerro Colorado Mining District, Cerro Colorado Mountains, Pima County, Arizona, USA
68.0km (42.3 miles) ⓘSilver Hill Mine (Gold Coin Mine), Cerro Colorado Mining District, Cerro Colorado Mountains, Pima County, Arizona, USA
68.5km (42.6 miles) ⓘSouth Opening, Silver Hill Mine (Gold Coin Mine), Cerro Colorado Mining District, Cerro Colorado Mountains, Pima County, Arizona, USA
References
MRDS databaseDep. ID file #10039661, MRDS ID #M050610.
 
and/or  
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