Metamorphosed bedded manganese ore in Paleozoic sediments (metachert). Several orebodies, including the largest known of this type in Japan: 65x58x13m.
(1952 production 34,000 tons ore of 39% Mn, mostly from rhodochrosite.) Ref: Symposium sobre Yacimientos de Manganeso (Mexico, 1956); ed: Jenaro Gonzalez Reyna; v. IV: Asia y Oceania.
Mineral List:22 entries listed. 18 valid minerals.
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