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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Gerhardtite from
Caledonia Mine, Mass City, Ontonagon County, Michigan, USA


09600380017363756504402.jpg
Gerhardtite, etc.

Caledonia Mine, Mass City, Ontonagon County, Michigan, USA
05270750017368982099475.jpg
Gerhardtite, etc.

Caledonia Mine, Mass City, Ontonagon County, Michigan, USA
02320720017363756518904.jpg
Gerhardtite, etc.

Caledonia Mine, Mass City, Ontonagon County, Michigan, USA
07634550017362503786168.jpg
Gerhardtite, etc.

Caledonia Mine, Mass City, Ontonagon County, Michigan, USA
00857470017363756515541.jpg
Gerhardtite, etc.

Caledonia Mine, Mass City, Ontonagon County, Michigan, USA
02320720017363756518904.jpg
Gerhardtite, etc.

Caledonia Mine, Mass City, Ontonagon County, Michigan, USA
09600380017363756504402.jpg
Gerhardtite, etc.

Caledonia Mine, Mass City, Ontonagon County, Michigan, USA
05270750017368982099475.jpg
Gerhardtite, etc.

Caledonia Mine, Mass City, Ontonagon County, Michigan, USA
02320720017363756518904.jpg
Gerhardtite, etc.

Caledonia Mine, Mass City, Ontonagon County, Michigan, USA
Locality type:Mine
Classification
Species:Gerhardtite
Formula:Cu2(NO3)(OH)3
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Native Copper3
Data
Mineral Data:Click here to view Gerhardtite data
Locality Data:Click here to view Caledonia Mine, Mass City, Ontonagon County, Michigan, USA
Data Identifiers
Mindat Occurrence Record ID:54586
Long-form Identifier:1:3:54586:8
GUID (UUID V4):0
References
Morris, Tom (1983) Michigan Mineralogy. A locality Index. Rocks & Minerals, 58 (3). 107-113 doi:10.1080/00357529.1983.11767128p.112
Huizing, M.E. (1988) Museum Notes and Announcements. Rocks & Minerals: 63(6): 494.
Rosemeyer, Tom (1990) Through the 'Scope. Rocks & Minerals, 65 (3) 240-243 doi:10.1080/00357529.1990.11761677
 
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