pearlstone
/'pɜ:lstəʊn/
📖 中文释义
- 珍珠岩
📘 English Definition（英文释义）
- 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.