Amethyst
 
Locality: Artigas, Artigas Department, Uruguay
 
Size: 84 mm x 56 mm, 190 grams
 
Amethyst is a beautiful violet to purple variety of Quartz. It is said to have formed when iron impurities in the Quartz was exposed to gamma irradiation. These Amethyst crystals that formed as geodes in Uruguay, are amongst the most intense purple specimens.