Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Conchoidal, Brittle
Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references, Conchoidal, Brittle
Perfect on {110}, poor on {101}, {001} rare
111 (perfect in four directions)