from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A white pearly mineral from hydrothermal alteration of basalt.
from The Century Dictionary and Cyclopedia
- n. A zeolitic mineral having the composition H4Ca4F2Si3O11. It occurs in hemispherical and spherical aggregates of small plates showing a perfect cleavage and pearly luster.
Sorry, no etymologies found.