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09157 - Huge Brown Natural Amethyst Geode Minas Gerais District - Brazil Prionolepis cataphractus Calvo and Salgado 1996

SKU: 29992906214
USD625.25 USD673.25

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Description

Calvo and Salgado 1996

It has tiny glued or filled fractures

Wasson (UCLA)

[This last paragraph is from Wikipedia - License: Attribution-ShareAlike 3

09157 - Huge Brown Natural Amethyst Geode Minas Gerais District - Brazil Prionolepis cataphractus Calvo and Salgado 1996Amethyst 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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