This amethyst crystal rosette is from Artigas in the Artigas Department of Uruguay. This department contains a sixty two square mile area in which amethyst can be found. Amethyst is the purple variety of quartz which is a silicate containing the elements Si and O. It gets its purple color from trace iron impurities in the crystal lattice. Crystals from Artigas tend to be smaller and have a richer purple color than those from Brazil.These crystals are translucent to transparent with a glass luster.This piece measures 2 1/8 x 2 x 1 3/4 inches or 52 x 50 x 45 mm.