Conchoidal, Brittle, Conchoidal
Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal
AlO(OH)Walter Schumann , Gemstones of the world (2001) More from other references
SrCO 3Walter Schumann , Gemstones of the world (2001) More from other references