20847 - Beautiful Purple Natural Amethyst Crystals Cluster Minas Gerais District - Brazil Brochantite The informations cited here come

The informations cited here come from the publication :

Either way it is a very interesting specimen

sedimentology

Lapparent 1957

77 in) It has a series of fractures which have been restored via the filling method

20847 - Beautiful Purple Natural Amethyst Crystals Cluster Minas Gerais District - Brazil Brochantite The informations cited here comeAmethyst 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.