Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Manganese-bearing Calcite from
Keystone Mine (Keystone claim; Goat claim), Slumgullion Pass, Castle Dome Mining District, Castle Dome Mountains, Yuma County, Arizona, USA


Locality type:Mine
Classification
Species:Calcite var: Manganese-bearing Calcite
Formula:(Ca,Mn)CO3
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Manganese-bearing Calcite data
Locality Data:Click here to view Keystone Mine (Keystone claim; Goat claim), Slumgullion Pass, Castle Dome Mining District, Castle Dome Mountains, Yuma County, Arizona, USA
Data Identifiers
Mindat Occurrence Record ID:239454
Long-form Identifier:1:3:239454:1
GUID (UUID V4):0
Nearest other occurrences of Manganese-bearing Calcite
7.6km (4.7 miles) ⓘBig Eye Mine group, Slumgullion Pass, Castle Dome Mining District, Castle Dome Mountains, Yuma County, Arizona, USA
7.7km (4.8 miles) ⓘBig Eye Mine, Big Eye Mine group, Slumgullion Pass, Castle Dome Mining District, Castle Dome Mountains, Yuma County, Arizona, USA
25.5km (15.9 miles) ⓘKing of Arizona Mine, Kofa Mining District, Yuma County, Arizona, USA
30.5km (19.0 miles) ⓘBlack King Mine, Tank Mountains Mining District, Tank Mountains, Yuma County, Arizona, USA
48.4km (30.1 miles) ⓘCash Entry Mine, Chloride-Mandarin-Cash Entry prospects, U.S. Army Yuma Proving Grounds, Silver Mining District, La Paz County, Arizona, USA
50.9km (31.6 miles) ⓘRiverview Mine, Imperial National Wildlife Refuge, Silver Mining District, La Paz County, Arizona, USA
53.3km (33.1 miles) ⓘMendevil Mine, Silver Mining District, La Paz County, Arizona, USA
53.6km (33.3 miles) ⓘClip Mine, Clip, Hidden Valley, Silver Mining District, La Paz County, Arizona, USA
53.6km (33.3 miles) ⓘDives Mine, Silver Mining District, La Paz County, Arizona, USA
53.6km (33.3 miles) ⓘAmelia Mine, Silver Mining District, La Paz County, Arizona, USA
References
Wilson, E.D. (1933), AZ Bur. Mines Bull. 134: 104-105.
 
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