Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Metallic
Gems, Conchoidal, Brittle
PbCa 3Zn 4(SiO 4) 4Anthony et al , Handbook of mineralogy (2001)
Ca 3Ti4+2(Fe3+2Si)O 12Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references