Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal
ConchoidalArthur Thomas, Gemstones (2009)
SrCO 3Walter Schumann , Gemstones of the world (2001) More from other references
MnTa 2O 6Walter Schumann , Gemstones of the world (2001) More from other references