[san-i-deen, -din]

noun Mineralogy.

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.

Origin of sanidine

1805–15; < German Sanidin, equivalent to Greek sanid- (stem of sanís plank) + German -in -ine2
Related formssan·i·din·ic [san-i-din-ik] /ˌsæn ɪˈdɪn ɪk/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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Historical Examples of sanidine

British Dictionary definitions for sanidine



an alkali feldspar that is a high-temperature glassy form of orthoclase in flat, tabular crystals, found in lavas and dykes. Formula: KAlSi 3 O 8

Word Origin for sanidine

C19: from German, from Greek sanis, sanidos a board
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