Subconchoidal, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references
Fibrous, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references
Octahedral, perfect on {111}, parting on {011}
Distinct on {100}, poor on {110}; parting on {001}