Uneven, Conchoidal, Conchoidal to uneven, Brittle
Uneven, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Metallic
On {10 1 1} perfect; parting on {10 1 2}
{0001} Imperfect, {1120} Imperfect
MnCO3
KCa 2AlBe 2Si 12O 30 · 0.5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references