Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Uneven
Handbook of mineralogy (2001)
Mn 3B 7O 13ClMichael OâDonoghue , Gems, Sixth Edition (2006)
Na x[Fe2+2(Al,Fe3+ )]Al 6(BO 3) 3Si 6O 18(OH) 4Anthony et al , Handbook of mineralogy (2001)