Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Uneven
Conchoidal, Brittle, Conchoidal, Brittle, Conchoidal, Brittle
Mn 3B 7O 13ClMichael OâDonoghue , Gems, Sixth Edition (2006)
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)