Uneven, Brittle, Metallic, Brittle, Metallic, Brittle, Metallic
Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references, Conchoidal, Brittle
Good on {110}, (110) ^ (1 1 0) ≈87°; parting on {100}
111 (perfect in four directions)