Amethyst Plates, B Grade, per lb Merkabahs The chemical formula for pyrite

The chemical formula for pyrite is FeS2

Polished Agua Nueva Agate specimen featuring pale mauve and pink banding with orange moss agate and spots of druzy

white and red agate

Pieces in the lot range from 1"- 3"

Amethyst Plates, B Grade, per lb Merkabahs The chemical formula for pyriteSmall Amethyst Plates from Uruguay. These flats are "B" grade Amethyst with coloring ranging from light to deep purple. The shapes and sizes vary, and pieces range from about 0. 10 1 pound. Its chemical formula is SiO2 and owes its purple coloration to irradiation of ferrous iron: Fe3+. This listing is for a one pound lot, which will consist of varying sized pieces. If you prefer larger or smaller pieces, please leave a note in your order, but