Whether you are a professional or a private individual, choose blue agate tumbled stones in 250g bags Description of blue agate tumbled stones in 250g bags The 250 grams of blue agate tumbled stones are part of the chalcedony family. They are formed from silica that lines rock cavities located in the middle of volcanic lava. Silica is deposited in concentric layers, flat or not, which creates the drawings appearing on the stones. The name agate comes from the Akhates river in Sicily but the 250 grams of blue agate tumbled stones can come from several different deposits in the world, including Madagascar, Switzerland, Italy, Uruguay, the United States or Brazil. Blue agate stones were used in antiquity to make various objects, such as jewelry (necklaces, bracelets, amulets...) or utensils (bowls, vases...). This 250 g bag of blue agate tumbled stones contains stones that have