Perlite, obsidian and pitchstone are volcanic glass having the same compositions commonly with rhyolite as well as andesite and basalt.
、黑耀和松脂等玻璃质熔以酸性
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.
、黑耀和松脂等玻璃质熔以酸性主，中基性者也常见。
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