Definitions

from The Century Dictionary.

  • noun A zeolitic mineral having the composition H4Ca4F2Si3O11. It occurs in hemispherical and spherical aggregates of small plates showing a perfect cleavage and pearly luster.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun mineralogy A white pearly mineral from hydrothermal alteration of basalt.

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