- Mineralogy.
- a gray, pink, or yellow mica, occurring in brittle monoclinic crystals.
- an aggregate of small, rudimentary crystals resembling minute globules in a row: found in glassy volcanic rocks.
- a pearl.
- a pink pearly micaceous mineral consisting of hydrated calcium aluminium silicate. Formula: CaAl 4 Si 2 O 10 (OH) 2
- an aggregate of minute beadlike masses occurring in some glassy igneous rocks
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