Single 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 ... . Contain 5-9 Al2O3 and small amounts of Na2O, some Fe2O3.A: the general characteristics of crystallization columnar or its granular form, can contain ...