Subconchoidal, Uneven, Conchoidal, Uneven
Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Mg 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)