Perlite, obsidian and pitchstone are volcanic glass having the same compositions commonly with rhyolite as well as andesite and basalt.
珍珠
、黑耀和松脂等玻璃
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、黑耀和松脂等玻璃酸性为主，中性者也常见。
声
：
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