pitchstone

常见例句

• Perlite, obsidian and pitchstone are volcanic glass having the same compositions commonly with rhyolite as well as andesite and basalt.
  珍珠岩、黑耀岩和松脂岩等玻璃质熔岩以酸性为主，中基性者也常见。
• Keywords vitrified micro-drop;thermal insulating material;imbibition;pitchstone;
  玻化微珠;保温材料;膨化;松脂岩;
• Porphyritic Pitchstone
  n. 斑状松脂岩(岩浆岩)
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