Uneven, Subconchoidal, Uneven, Subconchoidal, Conchoidal, Brittle
Uneven, UnevenArthur Thomas, Gemstones (2009), Splintery
NaAlSi 2O 6 · H 2OMichael OâDonoghue , Gems, Sixth edition (2006) More from other references
Ca 2(Mg,Fe) 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.