Perlite, obsidian and pitchstone are volcanic glass having the same compositions commonly with rhyolite as well as andesite and basalt.
珍珠岩、黑耀岩和
岩等玻
质熔岩以酸性
主，中基性者也常见。
,
石Perlite, obsidian and pitchstone are volcanic glass having the same compositions commonly with rhyolite as well as andesite and basalt.
珍珠岩、黑耀岩和岩等玻质熔岩以酸性主，中基性者也常见。
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