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dravite

A trigonal mineral, 3(NaMg3Al6(OH,F)4(BO3)3Si6O18) ; tourmaline group; forms series with schorl and with elbaite; in triangular or hexagonal prisms; pyroelectric and piezoelectric; in metamorphic and metasomatic lime-rich rocks; slices are used to measure transient blast pressures.

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  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 分数
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