Small island with active volcano. Augite-olivine basalt. Famous as the classic locality for anorthite crystals, thousands of which were thrown out loose by the 1870 eruption and distributed in collections around the world; usually coated with a film of reddish or blackish glassy lava. Very rare, red transparent crystals have been facetted as gems. Some crystals display metallic schiller caused by discontinuous included films of native copper and/or copper-zinc alloys. (Since 2001, collecting has been impossible because of ongoing eruptions of large quantities of acid gas; the entire population has been evacuated to Tokyo city and ferry service has ceased.)
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Map Reference: 34°5'N , 139°32'E
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Mineral List:8 entries listed. 7 valid minerals.
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