Perlite, obsidian and pitchstone are volcanic glass having the same compositions commonly with rhyolite as well as andesite and basalt.
珍珠
、
和松脂等玻璃质熔以酸性为主，中
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、和松脂等玻璃质熔以酸性为主，中性者也常见。
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