20847 - Beautiful Purple Natural Amethyst Crystals Cluster Minas Gerais District - Brazil Brochantite sedimentology

sedimentology

Reedops sp

Specimens: Type specimens include 2406 g

Beautiful rostral tooth of this species (Schizorhiza) of the Upper Cretaceous

Either way it is a very interesting specimen

20847 - Beautiful Purple Natural Amethyst Crystals Cluster Minas Gerais District - Brazil Brochantite sedimentologyAmethyst 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.