09103 - Beautiful Purple Natural Amethyst Geode Minas Gerais District - Brazil Reptile Bones Simankovo Formation
Yard notes & kiln story
Description
Simankovo Formation
updated 14 Jan 2012)
we can observe a fly (Trychoptera - Caddisfly)
Retrieved 12 December 2015
Aegirocassis benmoulai
09103 - Beautiful Purple Natural Amethyst Geode Minas Gerais District - Brazil Reptile Bones Simankovo FormationAmethyst 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.