Fibrous
Uneven, Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Uneven, Subconchoidal, Brittle, Metallic, Brittle, Metallic
Mg 3(Si 2O 5)(OH) 4Gemdat.org , Management Team (2012)
Zn 2(AsO 4)(OH)Michael OâDonoghue , Gems, Sixth edition (2006)