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sanidine

[san-i-deen, -din] /ˈsæn ɪˌdin, -dɪn/
noun, Mineralogy
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.
Origin
1805-1815
1805-15; < German Sanidin, equivalent to Greek sanid- (stem of sanís plank) + German -in -ine2
Related forms
sanidinic
[san-i-din-ik] /ˌsæn ɪˈdɪn ɪk/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for sanidine
  • Select all extrusive igneous rock units that contain sanidine.
  • Display all extrusive igneous rock units that contain sanidine.
  • Show me all extrusive igneous rock units that contain sanidine.
British Dictionary definitions for sanidine

sanidine

/ˈsænɪˌdiːn; -dɪn/
noun
1.
an alkali feldspar that is a high-temperature glassy form of orthoclase in flat, tabular crystals, found in lavas and dykes. Formula: KAlSi3O8
Word Origin
C19: from German, from Greek sanis, sanidos a board
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for sanidine

alkali feldspar mineral, a high-temperature form of potassium aluminosilicate (KAlSi3O8) that sometimes occurs in surface rocks. Sanidine forms colourless or white, glassy, transparent crystals in acidic volcanic rocks.

Learn more about sanidine with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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