Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)
Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal
2,1 basal ; 2,1 prismatic ; 3,1 pinacoidal
{110} Good
Plagioclase Feldspar s: (Na,Ca)Al1-2Si3-2O8 Orthoclase Feldspar : KAlSi3O8
SrCO 3Walter Schumann , Gemstones of the world (2001) More from other references