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Natronambulite from the Dohnoiri mine, Kanuma City, Tochigi Prefecture, Japan
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Matsubara Satoshi
,
Kato Akira
,
Miyawaki Ritsuro
,
Komuro Yoshiro
,
Okada Yoshio
… It is an essential constituent of bedded manganese ores formed by very weak metamorphism. … The other manganese minerals are braunite, rhodochrosite and rhodonite. … Natronambulite and nambulite in Japan have been found in weakly to moderately meta-morphosed bedded manganese ore deposits which are principally developed in such a siliceous rock as chert in Jurassic melange. … The ore minerals therefrom include braunite without exception. …
Bulletin of the National Museum of Nature and Science. Series C, Geology & paleontology 33, 1-5, 2007-12
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