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adularia

[aj-uh-lair-ee-uh] /ˌædʒ əˈlɛər i ə/
noun, Mineralogy
1.
a sometimes opalescent variety of orthoclase formed at a low temperature.
Origin of adularia
1790-1800
1790-1800; < Italian < French adulaire, named after Adula a mountain group in Switzerland; see -ary
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for adularia

adularia

/ˌædjʊˈlɛərɪə/
noun
1.
a white or colourless glassy variety of orthoclase in the form of prismatic crystals. It occurs in metamorphic rocks and is a minor gemstone. Formula: KAlSi3O8
Word Origin
C18: via Italian from French adulaire, after Adula, a group of mountains in Switzerland
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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