Onyx is a flat layered agate with the same black and white pattern.
In addition to the chalcedony, the fine minerals that make up the agate sometimes see a small amount of opal or cryptocrystalline particulate quartz. Strictly speaking, there is no characteristic of the strip pattern, it can not be called agate, only called chalcedony. Some of the chalcedony without the pattern on the market today is also called "agate", which is inconsistent with the meaning of ancient agate. Agate is pure white, because other metal elements (such as Fe, Ni, etc.) appear gray, brown, red, blue, green, emerald green, pink green, black and other colors, sometimes several colors appear mixed or appear. The agate block is transparent, translucent and opaque, with a lustrous to waxy finish. The hardness is 6.5 to 7, and the specific gravity is 2.65.
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