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Meaning of sanidine

san•i•dine

Pronunciation: (san'i-dēn", -din), [key]
— n. Mineral.
  1. a glassy, often transparent variety of orthoclase in which sodium may replace as much as 50 percent of the potassium: forms phenocrysts in some igneous rocks.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.