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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Phosphophyllite from
Big Chief Mine, Glendale, Keystone Mining District, Pennington County, South Dakota, USA


02732910017427132247725.jpg
Phosphophyllite

Big Chief Mine, Glendale, Keystone Mining District, Pennington County, South Dakota, USA
00533640017362255717145.jpg
Phosphophyllite

Big Chief Mine, Glendale, Keystone Mining District, Pennington County, South Dakota, USA
06958130017362255716223.jpg
Phosphophyllite

Big Chief Mine, Glendale, Keystone Mining District, Pennington County, South Dakota, USA
00262250017272015729916.jpg
Phosphophyllite, etc.

Big Chief Mine, Glendale, Keystone Mining District, Pennington County, South Dakota, USA
05587060017427125582832.jpg
Phosphophyllite

Big Chief Mine, Glendale, Keystone Mining District, Pennington County, South Dakota, USA
00533640017362255717145.jpg
Phosphophyllite

Big Chief Mine, Glendale, Keystone Mining District, Pennington County, South Dakota, USA
06958130017362255716223.jpg
Phosphophyllite

Big Chief Mine, Glendale, Keystone Mining District, Pennington County, South Dakota, USA
01769320017362255725406.jpg
Phosphophyllite, etc.

Big Chief Mine, Glendale, Keystone Mining District, Pennington County, South Dakota, USA
04623110017427133455034.jpg
Phosphophyllite

Big Chief Mine, Glendale, Keystone Mining District, Pennington County, South Dakota, USA
07809520017362255724919.jpg
Phosphophyllite

Big Chief Mine, Glendale, Keystone Mining District, Pennington County, South Dakota, USA
00901270017362255731890.jpg
Phosphophyllite

Big Chief Mine, Glendale, Keystone Mining District, Pennington County, South Dakota, USA
00262250017272015729916.jpg
Phosphophyllite, etc.

Big Chief Mine, Glendale, Keystone Mining District, Pennington County, South Dakota, USA
Locality type:Mine
Classification
Species:Phosphophyllite
Formula:Zn2Fe 2+(PO4)2 · 4H2O
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Whitmoreite2
Data
Mineral Data:Click here to view Phosphophyllite data
Locality Data:Click here to view Big Chief Mine, Glendale, Keystone Mining District, Pennington County, South Dakota, USA
Photo GalleryView Gallery (3 photos)
Data Identifiers
Mindat Occurrence Record ID:49420
Long-form Identifier:1:3:49420:9
GUID (UUID V4):0
References
Campbell, Thomas J., Roberts, Willard L. (1985) Mineral Localities in the Black Hills of South Dakota. Rocks & Minerals, 60 (3) 109-118 doi:10.1080/00357529.1985.11764385p.116
 
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