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Physical Properties
Crystal System: MonoclinicCrystal Form: Acicular, fibrousCrystal Habit: Massive, plumoseHardness: 2.5Cleavage/Fracture: {001} good; uneven or shell-like fracturesLuster: MetallicColor: Lead-grayStreak: Lead-graySpecific Gravity: 5.5-5.7Other Characteristics: Opaque |
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