Miyake Island (Miyake-jima), Izu Archipelago, Tokyo Metropolis, Japan
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|Latitude & Longitude (WGS84):||34° 4' 59'' North , 139° 31' 59'' East|
|Latitude & Longitude (decimal):||34.0833333333, 139.533333333|
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 July 1874 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.
Mindat ArticlesAnorthite and Native Brass by Alfredo Petrov
10 valid minerals.
Rock Types RecordedEntries shown in red are rocks recorded for this region.
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