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.
  珍珠巖、黑耀巖和松脂巖等玻璃質熔巖以酸性爲主，中基性者也常見。
• Keywords vitrified micro-drop;thermal insulating material;imbibition;pitchstone;
  玻化微珠;保溫材料;膨化;松脂巖;
• Porphyritic Pitchstone
  n. 斑狀松脂巖(巖漿巖)
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