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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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Marcasite from
Oppu Mine, Nishimeya-mura, Nakatsugaru District, Aomori Prefecture, Japan


06417170017369108292976.jpg
Marcasite

Oppu Mine, Nishimeya-mura, Nakatsugaru District, Aomori Prefecture, Japan
01680660017369108302392.jpg
Marcasite

Oppu Mine, Nishimeya-mura, Nakatsugaru District, Aomori Prefecture, Japan
09704950017272724462296.jpg
Marcasite

Oppu Mine, Nishimeya-mura, Nakatsugaru District, Aomori Prefecture, Japan
01680660017369108302392.jpg
Marcasite

Oppu Mine, Nishimeya-mura, Nakatsugaru District, Aomori Prefecture, Japan
09704950017272724462296.jpg
Marcasite

Oppu Mine, Nishimeya-mura, Nakatsugaru District, Aomori Prefecture, Japan
01680660017369108302392.jpg
Marcasite

Oppu Mine, Nishimeya-mura, Nakatsugaru District, Aomori Prefecture, Japan
Locality type:Mine
Classification
Species:Marcasite
Formula:FeS2
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Rhodochrosite2
Data
Mineral Data:Click here to view Marcasite data
Locality Data:Click here to view Oppu Mine, Nishimeya-mura, Nakatsugaru District, Aomori Prefecture, Japan
Data Identifiers
Mindat Occurrence Record ID:148162
Long-form Identifier:1:3:148162:4
GUID (UUID V4):0
Nearest other occurrences of Marcasite
28.6km (17.8 miles) ⓘDoyashiki deposit, Hanaoka mine, Odate, Akita Prefecture, Japan
28.6km (17.8 miles) ⓘYunosawa mine, Ikarigaseki, Minamitsugaru District, Aomori Prefecture, Japan
31.3km (19.4 miles) ⓘShakanai Mine, Odate, Akita Prefecture, Japan
51.4km (31.9 miles) ⓘOsarizawa Mine, Kazuno City, Akita Prefecture, Japan
60.6km (37.6 miles) ⓘFurokura mine, Kazuno City, Akita Prefecture, Japan
81.9km (50.9 miles) ⓘMatsuo mine, Hachimantai City, Iwate Prefecture, Japan
94.8km (58.9 miles) ⓘArakawa Mine, Kyohwa, Semboku District, Akita Prefecture, Japan
References
C. Lemanski collection (7285CL).
 
and/or  
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