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boracite

An orthorhombic mineral, 8(Mg6B14O26Cl2) ; isometric above 265 degrees C in hard, glassy, cubic and octahedral crystals; strongly pyroelectric; in evaporites, a source of boron.

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  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 分数
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