Uneven, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Metallic
Conchoidal, Conchoidal, Gemstones (2009), Uneven
{0001} Imperfect, {1120} Imperfect
Perfect on { 2 01} fair on {010}
KCa 2AlBe 2Si 12O 30 · 0.5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Cu2CO3(OH)2