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sanidine

[ san-i-deen, -din ]

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.


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: KAlSi 3 O 8
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


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Other Words From

  • san·i·din·ic [san-i-, din, -ik], adjective
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Word History and Origins

Origin of sanidine1

1805–15; < German Sanidin, equivalent to Greek sanid- (stem of sanís plank) + German -in -ine 2
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Word History and Origins

Origin of sanidine1

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

All the upper part of the mountain is composed of a pumiceous tufa, rich in sanidine and of a characteristic greenish colour.

Sanidine, san′i-din, n. a clear glassy variety of orthoclase.

It is remarkable for the large crystals of sanidine (glassy felspar) which it contains, and has a rude columnar structure.

(c.) Phonolite (Clinkstone) is a trachytic rock, composed essentially of sanidine, nepheline, and augite or hornblende.

Trachyte from Hungary; felsitic paste with crystals of hornblende and sanidine, and a little magnetite.

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