Fibrous, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references
Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
Distinct on {100}, poor on {110}; parting on {001}
{???} Distinct, {???} Indistinct