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AMETHYST AGATE

zAmethyst Agate

Amethyst Agate is a member of the chalcedony group of stones, which is then part of the quartz family.   All types of quartz will come from silica, however, the crystal structures will vary, one of which is amethyst.   To tell the difference between the two when combined is that agate will have a banded pattern, one that you can often see through.   Amethyst, on the other hand, will be a varying purple color, from sometimes an almost pure white to a deep, dark purple.

Amethyst Agate forms when silica-rich solutions deposit successive chalcedony layers within cavities or seams, and later phases crystallize as purple quartz. The white to grey microcrystalline bands of agate (chalcedony) alternate with zones tinted by iron-based color centers that yield the amethyst hue. 

Deposits occur wherever agate and amethyst share geological histories: Brazil and Uruguay are classic sources, while Madagascar, India, and parts of Africa produce striking banded material. 

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