Conchoidal, Brittle, Conchoidal, Brittle, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Conchoidal, Brittle, Conchoidal, Brittle, Conchoidal, Brittle
[001] good, [210] distinct
{110} Perfect, {???} Distinct, {???} Distinct
PbSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)