pearlstone
/ˈpəːlstəʊn/Geology
noun
A greyish glassy volcanic rock characterized by concentric spheroidal cracks.
Origin
Early 19th century; earliest use found in William Henry (1774–1836), chemist. From pearl + stone.
| 单词 | pearlstone |
| 释义 | pearlstone/ˈpəːlstəʊn/Geology noun A greyish glassy volcanic rock characterized by concentric spheroidal cracks. Origin |
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