Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Metallic
Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
PbCa 3Zn 4(SiO 4) 4Anthony et al , Handbook of mineralogy (2001)
Mg 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)