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It's a showdown with rare earth elemental ore Monazite-(Ce) and index mineral Andalusite.
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Chalcocite from
Kosaka mine, Kosaka, Akita Prefecture, Japan


Locality type:Mine
Classification
Species:Chalcocite
Formula:Cu2S
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Chalcocite data
Locality Data:Click here to view Kosaka mine, Kosaka, Akita Prefecture, Japan
Data Identifiers
Mindat Occurrence Record ID:444091
Long-form Identifier:1:3:444091:8
GUID (UUID V4):0
Nearest other occurrences of Chalcocite
6.0km (3.7 miles) ⓘAinai mine, Kosaka, Akita Prefecture, Japan
10.9km (6.8 miles) ⓘFukasawa mine (Fukazawa mine), Odate, Akita Prefecture, Japan
16.6km (10.3 miles) ⓘShakanai Mine, Odate, Akita Prefecture, Japan
17.8km (11.0 miles) ⓘHanaoka mine, Odate, Akita Prefecture, Japan
18.3km (11.4 miles) ⓘOsarizawa Mine, Kazuno City, Akita Prefecture, Japan
28.6km (17.8 miles) ⓘTatemata mine, Hinai, Odate, Akita Prefecture, Japan
45.5km (28.2 miles) ⓘKamikita mine, Kamikita District, Aomori Prefecture, Japan
50.4km (31.3 miles) ⓘAni Mine, Ani-machi, Kitaakita City, Akita Prefecture, Japan
93.6km (58.1 miles) ⓘNoda-Tamagawa mine, Noda, Kunohe-gun, Iwate Prefecture, Japan
References
www.mineralmundi.com/japan.htm
Takeo Katou (1918) journal of the Geological Society of Tokyo, 25, #295, 1-7.
Nokleberg, W.J., ed., (2010) Metallogenesis and tectonics of northeast Asia: U.S. Geological Survey Professional Paper 1765, 624 p.
 
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