Black agate necklace composed of 14mm ball stones Description of the black agate necklace in 14mm ball stones France Minerals introduces you to the 14mm black agate necklace. Black agate takes its name from the river Akhates in Sicily. Agate has been exploited since ancient times for its virtues. It is also used in the manufacture of jewelry such as necklaces, bracelets. Composed mainly of silica, black agate is part of the quartz family. It forms in volcanic lavas. In fact, when lava solidifies, it becomes a quartz mass. Black agate has several colors. Agate stone has a large number of deposits throughout the world due to its different varieties. Indeed, agate with pink, green, red, yellow colored stripes is found in deposits located in Australia, the United States or even in Germany. Other varieties of agate can be seen in Mexico, Madagascar, Brazil, China. Virtues of the Coll