Conchoidal, Brittle, Conchoidal, Brittle, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
[001] good, [210] distinct
{010} moderate, {100} imperfect
PbSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Fe 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)