Uneven, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Metallic
Subconchoidal, Conchoidal, Brittle
{0001} Imperfect, {1120} Imperfect
Fair on {100}, poor on {001} and {010}
KCa 2AlBe 2Si 12O 30 · 0.5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Mg2Al4Si5O18