ADULARIA

Etymology

Named for the type locality at Adular, Switzerland.

Noun

adularia (plural adularias)

A variety of orthoclase feldspar found as colorless to white prismatic crystals in cavities in metamorphic rocks. Some specimens reflect a bluish sheen along crystal faces. This phenomenon is called adularescence, and adularia with this property is called moonstone. (See sanidine).

Source: Wiktionary

Ad`u*la"ri*a, n. Etym: [From Adula, a mountain peak in Switzerland, where fine specimens are found.] (Min.)

Definition: A transparent or translucent variety of common feldspar, or orthoclase, which often shows pearly opalescent reflections; -- called by lapidaries moonstone.

Source: Webster’s Unabridged Dictionary 1913 Edition

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