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 Recorded
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Select Rock List TypeAlphabetical List Tree Diagram
Entries shown in red are rocks recorded for this region.
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