Agate, also known as agate, Kate Ma and agate, is a kind of chalcedony mineral. It is usually a banded rock block mixed with opal and aphanitic. Its hardness is 6.5-7 degrees, its specific gravity is 2.65, and its color is quite layered. Translucent or opaque. The primitive form of tripartite crystal system. It is often dense and massive, forming various structures, such as breast, grape and tuberculosis. The common structure is concentric circles.