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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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Britholite-(Y) from
Gislesjø, Kilebygda, Skien, Telemark, Norway


02601910017362120518516.jpg
Britholite-(Y)

Gislesjø, Kilebygda, Skien, Telemark, Norway
02601910017362120518516.jpg
Britholite-(Y)

Gislesjø, Kilebygda, Skien, Telemark, Norway
07811150017272034575736.jpg
Britholite-(Y)

Gislesjø, Kilebygda, Skien, Telemark, Norway
Locality type:Quarry
Classification
Species:Britholite-(Y)
Formula:(Y,Ca)5(SiO4)3OH
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Britholite-(Y) data
Locality Data:Click here to view Gislesjø, Kilebygda, Skien, Telemark, Norway
Data Identifiers
Mindat Occurrence Record ID:88507
Long-form Identifier:1:3:88507:6
GUID (UUID V4):0
References
Neumann, Henrich (1985) Norges Mineraler [The Minerals of Norway]. Norges geologiske Undersøkelse Skrifter Vol. 68. Universitetsforlaget
 
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