Company Description
Color Iron-black; gray with a brownish tint in reflected light
Crystal habit Granular to massive and lamellar exsolutions in hematite or magnetite
Crystal system Trigonal
Twinning {0001} simple, {1011} lamellar
Cleavage absent; parting on {0001} and {1011}
Fracture Conchoidal to subconchoidal
Tenacity Brittle
Mohs scale hardness 5?6
Luster Metallic to submetallic
Streak Black
Diaphaneity Opaque
Specific gravity 4.70?4.79
Optical properties Uniaxial (?)
Birefringence Strong; O = pinkish brown, E = dark brown (bireflectance)
Other characteristics
Selling of Mineralsakly magnetic