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Okutama Mine

Hikawa, Okutama city, Nishi-tama county, Tokyo, Japan


Field of view: 30 mm. Banded caryopilite. The translucent brown bands with a vitreous luster are aggregate of fine caryopilite crystals. Carypilite forms banded structure with pink bands of rhodochrosite and white bands of quartz. The massive pale brown bands are aggregate of fine quartz and caryopilite crystals. The pink vein traversing bands at the bottom is coarser rhodochrosite.

Recovered from a chert-hosted bedded manganese deposit subjected to weak Prehnite-Pumpellyite facies metamorphism.

Caryopilite from this location was described in 1977 as bementite.

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