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Manganite?

Iwaisawa Mine

Kitagawa, Hanno city, Saitama pref., Japan

Source for manganese

Manganite

Field of view: 10 mm. Probably manganite. The fan-like groups of black acicular crystals with a metallic luster are probably manganite. The reddish-brown host is hematite-rich chert. The white part at the lower left is a quartz vein.

Recovered from a meteoric oxidationzone of a chert-hosted bedded manganese deposit subjected to Pumpellyite-Actinolite facies metamorphism.

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