Uneven, Conchoidal, Conchoidal to uneven, Brittle
UnevenAnthony et al, Handbook of mineralogy (2001), UnevenAnthony et al, Handbook of mineralogy (2001)
On {10 1 1} perfect; parting on {10 1 2}
{100} Perfect, {001} Perfect
MnCO3
Na(Mn2+ ,Ca) 2Si 3O 8(OH)Michael OâDonoghue , Gems, Sixth Edition (2006)