Subconchoidal, Uneven, Conchoidal, Uneven
Conchoidal, Brittle, Metallic, Conchoidal, Handbook of mineralogy (2001)
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
(Mg,Fe2+ ) 3Si 2O 5(OH) 4Anthony et al , Handbook of mineralogy (2001)