Miyake Island (Miyake-jima), Izu Archipelago, Tokyo Prefecture, Japan
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. Some crystals display metallic schiller caused by discontinuous included films of native copper and/or copper-zinc alloys. Visiting and collecting here is sometimes impeded by eruptions of SO2 and H2S gas.
Photo: Tanaka Yuko
Mindat ArticlesAnorthite and Native Brass by Alfredo Petrov
11 entries listed. 8 valid minerals.
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