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Definition of Brewsterite
1. n. A rare zeolitic mineral occurring in white monoclinic crystals with pearly luster. It is a hydrous silicate of aluminia, baryta, and strontia.
Definition of Brewsterite
1. Noun. (minerology) Any of a series of hydrothermal tectosilicate minerals of the zeolite group. ¹
¹ Source: wiktionary.com