White, Yellow, Pale blue, Brittle, Uneven
UnevenAnthony et al, Handbook of mineralogy (2001) More from other references, UnevenAnthony et al, Handbook of mineralogy (2001) More from other references, Brittle, Metallic
Perfect on {100} and {010}, imperfect on {101}
{100} Good, {010} Good, {001} Good