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adularia

[aj-uh-lair-ee-uh]
noun Mineralogy.
  1. a sometimes opalescent variety of orthoclase formed at a low temperature.
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Origin of adularia

1790–1800; < Italian < French adulaire, named after Adula a mountain group in Switzerland; see -ary
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for adularia

adularia

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: KAlSi 3 O 8
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Word Origin for adularia

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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012