Uneven, Conchoidal, UnevenArthur Thomas, Brittle
Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
Fe2+ CO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Mg 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)