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Volcanite, the mineral, is an old mineral name used as a synonym
of pyroxene and a variety of sulfur containing less than one percent
Volcanite, the rock, is an extrusive rock composed chiefly of
anorthoclase, andesine and augite phenochrysts in a glassy
groundmass containing feldspar and augite microlites.
I assume Volcanit is a trade name.
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