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Age range: 460
It has fractures that have been glued and filled (restored)
Africa and North America
Iberocoryphe
20139 - Beautiful Purple Natural Amethyst Crystals Cluster Minas Gerais District - Brazil Cobaltoan calcite Age range: 460Amethyst is a purple variety of quartz (SiO2) and owes its violet color to irradiation, impurities of iron and in some cases other transition metals, and the presence of other trace elements, which result in complex crystal lattice substitutions. The hardness of the mineral is the same as quartz, thus making it suitable for use in jewelry.
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