Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Metallic
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle
PbCa 3Zn 4(SiO 4) 4Anthony et al , Handbook of mineralogy (2001)
MgCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references