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
以酸性为主,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、黑耀
和
等玻璃质熔
以酸性为主,中基性者也常见。
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