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Inclusions of blue dumortierite or sodalite
Amethyst is a purple variety of quartz that derives its color from irradiation and the presence of iron inclusions within the crystal lattice
phyllosilicates
The mineral composition of the shell can include iron
Green Onyx Vase (3-inch) slab Inclusions of blue dumortierite orPakistani onyx, the bands formed by the deposition of calcite saturated with iron. The iron oxidizes into reddish bands while the reduced iron creates green or whitish banding. These pieces are polished into a vase shape. You will receive one piece selected from our current stock. All pieces are of similar size and quality. Average measurements: 3. 0 L x 3. 0 W x 2. 75 H inches Average weight: 1 pound
