- a sometimes opalescent variety of orthoclase formed at a low temperature.
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
- 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
C18: via Italian from French adulaire, after Adula, a group of mountains in Switzerland
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