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black lead

A hexagonal and trigonal mineral, native carbon 4(C) , polymorphous with chaoite, diamond, and lonsdaleite; scaly, soft, lustrous, metallic; greasy feel; as crystals, flakes, scales, laminae, or grains in veins or bedded masses or disseminations in carbonaceous metamorphic rocks; conducts electricity well, is soft and unctuous; immune to most acids; extremely refractory.

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  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 分数
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