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