09157 - Huge Brown Natural Amethyst Geode Minas Gerais District - Brazil Prionolepis cataphractus Morocco Date: P 2018 Mass

Morocco Date: P 2018 Mass (g): 7

Esmeraldina sp

southern Morocco

Calvo and Salgado 1996

This enormous Prognathodon tooth is preserved associated with Squalicorax shark tooth

09157 - Huge Brown Natural Amethyst Geode Minas Gerais District - Brazil Prionolepis cataphractus Morocco Date: P 2018 MassAmethyst 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.