Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Uneven
Brittle, Uneven
Mn 3B 7O 13ClMichael OâDonoghue , Gems, Sixth Edition (2006)
Mn2+5(PO 4) 2(PO 3OH) 2 · 4H 2O)Michael OâDonoghue , Gems, Sixth Edition (2006)