Perlite, obsidian and pitchstone are volcanic glass having the same compositions commonly with rhyolite as well as andesite and basalt.
珍珠
、黑耀和
等玻璃质熔
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、黑耀和等玻璃质熔酸性主，中基性者也常见。
声
：
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