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adularia in British English
(ˌædjʊˈlɛərɪə)
noun
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 Switzerlandadularia in American English
(ˌædʒuˈlɛriə; ˌædʒəˈlɛriə)
noun
a transparent or translucent variety of orthoclase
Word origin
It < Fr adulaire, after Adula, a group of mountains in Switzerland + -aire, -aryImage ofadularia
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