... chip. Complete crystal shape, often with a rare collection granular and column column. Dark green, green, blue, green, so Single chip. Complete ... crystal shape, often with a rare collection granular and column column. Dark green, green, blue, green, sometimes even in gray. ... among series is pyroxene, a variant. Contain 5-9 Al2O3 and small amounts of Na2O, some Fe2O3.A: the general ...