ConchoidalAnthony et al, Handbook of mineralogy (2001), ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal
Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001), Brittle
CaBe 2(PO 4) 2Michael OâDonoghue , Gems, Sixth Edition (2006)
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references