ConchoidalArthur Thomas, Gemstones (2009)
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
MnTa 2O 6Walter Schumann , Gemstones of the world (2001) More from other references
CaCO 3Ulrich Henn and Claudio C.