Agate, also known as code agate, manao, horse brain, etc., is a kind of chalcedony minerals, often mixed with opal and cryptocrystalline quartz banded mass, hardness 6.5-7 degrees, specific gravity 2.65, the color is quite hierarchical, translucent or opaque.
Agate original form tripartite crystal system. Often dense block and the formation of a variety of structures, such as breast-shaped, grape-shaped, nodular, etc., common for concentric circle structure.
Agate has a different color composition of chalcedony, usually, green, red, yellow, brown, white and other colors.
Ancient people often crushed and ground it, adding solvent components, made of mineral pigments, used for painting. It is also used as a medicine.
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