sanidine: Meaning and Definition of

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.