What is Grey Agate
It is a kind of chalcedony minerals. It is often a striped block mixed with opal and cryptocrystalline quartz. The hardness is 6.5-7 degrees, the specific gravity is 2.65, and the color is quite layered. Available in translucent or opaque. The original form of the trigonal crystal system. It is often dense and massive and forms various structures, such as breast, grape, tuberculosis, etc. The common concentric structure. Chalcedony with different colors, usually green, red, yellow, brown, white and other colors. According to the pattern and impurities, it can be divided into onyx, silk agate, moss agate, castle agate, etc. Often used as playthings, ornaments or ornaments.
