Conchoidal, Brittle, Conchoidal
UnevenAnthony et al, Handbook of mineralogy (2001), UnevenAnthony et al, Handbook of mineralogy (2001), Uneven
Good on [110] and on [001]
{010} Perfect, {001} Distinct
[ ]Na2(Mg3Al2)Si8O22(OH)2
Fe3+ PO 4 · 2H 2OAnthony et al , Handbook of Mineralogy (2001)