Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)
UnevenAnthony et al, Handbook of mineralogy (2001) More from other references, UnevenAnthony et al, Handbook of mineralogy (2001) More from other references, Brittle, Metallic
Mg 2Al 4Si 5O 18Ulrich Henn and Claudio C.
CoAsSAnthony et al , Handbook of mineralogy (2001)