Agate is also an agate, agate, horse brain and so on, is a kind of chalcedony minerals, often mixed with Opal and cryptic quartz ribbon block, the hardness of 6.5-7 degree, the proportion of 2.65, color is quite level. Having translucent or opaque. The original form is three - square crystal system. It is usually dense and lumpy, forming various structures, such as breasts, grapevines, tubercle and so on. Chalcedony, which has different colors, usually has many colors, such as green, red, yellow, brown and white. According to patterns and impurities, it can be divided into Onyx, agate, agate, Castle agate and so on. Often used as playthings, ornaments, ornaments or playthings. Ancient agate balls are often seen in funerary objects.
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