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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.


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