Amethyst Plates, A Grade, per lb From The USA he explains the complex physical

he explains the complex physical and chemical processes that lead to the formation of the different types of bands

Multiple photographs accompany each write-up

partially broken nodules are possible if they show good color and pattern and can cut a full face

See Chevron Amethyst

The specimen also displays spots of blue agate

Amethyst Plates, A Grade, per lb From The USA he explains the complex physicalSmall Amethyst Plates from Uruguay. These flats are "A" grade Amethyst with the deepest purple coloring. 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 preferences are not