Slice agat

Agate is a type of gemstone that consists of quartz and Yemeni stone and has various types and colors. Opals typically form among metamorphic and volcanic rocks. According to archaeological research, the first human use of agate dates back to the third millennium BC and the Indus Valley civilization. In ancient Greece, opals were used to make jewelry. Agate was also used to make seals and special insignia for Greek warriors.