Brittle, Metallic, Brittle, Metallic
Conchoidal, Brittle, Conchoidal, Brittle, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
{110} Perfect, {010} Perfect
[001] good, [210] distinct
Na 2ZrSi 3O 9 · 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
PbSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references