pearlstone的翻译，读音
英/'pɜ:lstəʊn/
释义：
珍珠岩
n. A glassy volcanic rock of a grayish color and pearly
luster, often having a spherulitic concretionary structure due to the
curved cracks produced by contraction in cooling. See Illust. under
Perlitic.
n. A glassy volcanic rock of a grayish color and pearly
luster, often having a spherulitic concretionary structure due to the
curved cracks produced by contraction in cooling. See Illust. under
Perlitic.