Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal
UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Conchoidal, Brittle
SrSO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
BaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references