Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)
Not Available
2,1 basal ; 2,1 prismatic ; 3,1 pinacoidal
Not Available
Plagioclase Feldspar s: (Na,Ca)Al1-2Si3-2O8 Orthoclase Feldspar : KAlSi3O8
(Ce,La,Nd,Th)PO 4Michael OâDonoghue , Gems, Sixth Edition (2006)