Conchoidal, Brittle, Metallic, Conchoidal, Handbook of mineralogy (2001)
Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Uneven
(Mg,Fe2+ ) 3Si 2O 5(OH) 4Anthony et al , Handbook of mineralogy (2001)
Mn 3B 7O 13ClMichael OâDonoghue , Gems, Sixth Edition (2006)