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Open Amethyst Geodes from Sonora, Mexico feature small double terminated amethyst crystals and druzy inside a pale pink and white matrix. These are already open geodes with sizes ranging from 4 - 7 cm in length.
Price is for one open geode piece, number of larger inner crystals will vary between each piece. Its chemical formula is SiO2 and owes its purple coloration to irradiation of ferrous iron: Fe3+.