20141 - Beautiful Purple Natural Amethyst Crystals Cluster Minas Gerais District - Brazil Anetoceras Brazil (3)
Yard notes & kiln story
Description
Brazil (3)
Acastocephala
lagoonal/restricted shallow subtidal
Specimen without preparation or cleaning
The root is completely authentic
20141 - Beautiful Purple Natural Amethyst Crystals Cluster Minas Gerais District - Brazil Anetoceras Brazil (3)Amethyst 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.