Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle
Uneven, Sub-Conchoidal, UnevenWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Metallic
MgCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
ZnCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references