ˈpearl-stone
The same as perlite.
| 1800 Henry Epit. Chem. (1808) 364 The same skilful analyst has found potash in Hungarian pearl-stone. 1852 Th. Ross Humboldt's Trav. I. ii. 102, I consider even the pearlstone as an unvitrified obsidian. |
ˈpearl-stone
The same as perlite.
| 1800 Henry Epit. Chem. (1808) 364 The same skilful analyst has found potash in Hungarian pearl-stone. 1852 Th. Ross Humboldt's Trav. I. ii. 102, I consider even the pearlstone as an unvitrified obsidian. |
Oxford English Dictionary