20142 - Beautiful Purple Natural Amethyst Crystals Cluster Minas Gerais District - Brazil Pterosaur claws This species belongs to the

This species belongs to the Hexanchidae family

except its root

Leiostegina

no carinae

Minerals were located and identified using BSE mode on Hitachi S3000N SEM coupled with an X-ray detector Bruker XFlash 3001 for microanalysis (EDS) and mapping

20142 - Beautiful Purple Natural Amethyst Crystals Cluster Minas Gerais District - Brazil Pterosaur claws This species belongs to theAmethyst 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.