Brittle, Uneven, Brittle, Uneven
ConchoidalAnthony et al, Handbook of mineralogy (2001), ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal
NaCa16Si23AlO60(OH)8•64(H2O)
CaBe 2(PO 4) 2Michael OâDonoghue , Gems, Sixth Edition (2006)