Gray Agate Mortar and Pestle: Agate is a microcrystalline variety of silica, chiefly chalcedony, distinguish by its fineness of grain and brightness of color. Agates are found in various kinds of rock. Gray Agate Mortar Pestle is classically related to volcanic rocks and can be common in certain metamorphic rocks. We check each piece of Gray Agate Mortar Pestle and tested it properly before dispatch. We make Agate Mortar and Pestle from natural agate after cutting, grinding, and polishing Most agates occur as nodules in volcanic rocks or ancient lavas where they represent cavities. It is originally produced by the disengagement of volatiles in the molten mass. It was then filled, wholly or partially, by siliceous matter deposited in regular layers upon the walls.
Agate has also been known to fill veins or cracks in volcanic or altered rock underlain by granitic intrusive masses. Such agates, when cut transversely, exhibit a succession of parallel lines, often of extreme tenuity, giving a banded appearance to the section. Moreover, Such stones are known as banded agate, riband agate, and striped agate.