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jadeite


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Isolated, rare mineral of the clinopyroxenes with the composition NaAlSi2O6; sp. gr. 3.2–3.4; hardness 6; granular crystals or massive; jade is the precious variety of jadeite, although the term includes the amphibole mineral nephrite; it occurs with albite in blueschists (glaucophane schists) under conditions of low temperature and high pressure at destructive plate margins.

Subjects: Earth Sciences and Geography.


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