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Physical Properties
Crystal System: IsometricCrystal Form: Cubic; dodecahedral; octahedralHabit: Massive; granular; reniform; concretion; botryoidal; discoidHardness: 6-6.5Cleavage/Fracture: {001} obscure; conchoidal to uneven fractureLuster: MetallicColor: Copper-yellowStreak: Black to green blackSpecific Gravity: 4.9-5.2Other Characteristics:(1) On the cubic crystal planes, lines are frequent, and the streaks on two connected planes are perpendicular.(2) With metallic luster, which dims if the mineral is placed in air for a long time(3) Interpenetrant crysta, or so-called Iron Cross Twin.(4) Crisp(5) Opaque(6) Occasionally slightly magnetic |
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