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Hamayokokawa mine (Hamayokogawa mine), Kami-Ina-gun, Nagano Prefecture, Chubu Region, Honshu Island, Japan

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:
Alabandite
Albite
Alleghanyite
'Amphibole Group'
Baryte
Braunite
Diopside
var: Schefferite ?

Hausmannite
Hematite
Jacobsite
Manganosite
Neotocite
'Psilomelane'
Pyrolusite
Pyrophanite
Quartz
Quartz
var: Chert

Rhodochrosite
Rhodonite
Spessartine
Tephroite
Todorokite


22 entries listed. 18 valid minerals.

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