Fibrous, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references
Uneven, Brittle, Metallic, Brittle, Metallic, Brittle, Metallic
Distinct on {100}, poor on {110}; parting on {001}
Good on {110}, (110) ^ (1 1 0) ≈87°; parting on {100}