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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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Jahnsite-(CaMnFe) from
Viitaniemi pegmatite, Eräjärvi area, Orivesi, Pirkanmaa, Finland


03730940017801674231255.jpg
Jahnsite-(CaMnFe), etc.

Viitaniemi pegmatite, Eräjärvi area, Orivesi, Pirkanmaa, Finland
03730940017801674231255.jpg
Jahnsite-(CaMnFe), etc.

Viitaniemi pegmatite, Eräjärvi area, Orivesi, Pirkanmaa, Finland
01728390017801674258600.jpg
Jahnsite-(CaMnFe), etc.

Viitaniemi pegmatite, Eräjärvi area, Orivesi, Pirkanmaa, Finland
Locality type:Pegmatite
Classification
Species:Jahnsite-(CaMnFe)
Formula:{Ca}{Mn2+}{Fe22+}{Fe23+}(PO4)4(OH)2 · 8H2O
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Vivianite2
Lithiophilite2
- var Sicklerite1
Fairfieldite1
Hureaulite1
Data
Mineral Data:Click here to view Jahnsite-(CaMnFe) data
Locality Data:Click here to view Viitaniemi pegmatite, Eräjärvi area, Orivesi, Pirkanmaa, Finland
Data Identifiers
Mindat Occurrence Record ID:98774
Long-form Identifier:1:3:98774:5
GUID (UUID V4):0
References
Sandström, Frej, Lahti, Seppo I. (2009) Viitaniemipegmatiten i Eräjärvi, Orivesi, Finland. Litofilen. Medlemsblad för Västerås AmatörGeologiska Sällskap, 26 (1) 11-38
 
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