Conchoidal, Brittle, Conchoidal
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
{010} perfect, {110} distinct, {100} in traces
Perfect on [10 1 1] three directions with angle of 74° 55
AlO(OH)Walter Schumann , Gemstones of the world (2001) More from other references
CaCO 3Ulrich Henn and Claudio C.