Uneven, Uneven, Gems, Sixth Edition (2006)
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), Uneven
2,1 basal ; 2,1 prismatic ; 3,1 pinacoidal
{010} Perfect
KAlSi3O8
(Al,Mg) 8(Al,Si) 6O 20Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references