Black agate. Black agate is rare in nature, and most of the black onyx in the Chinese jewelry market is optimized. However, since it has not added any other substances in the optimization process, it is still recognized as a natural gem in jewelry identification. Agate is dark and easy to mix with other black jade. Its hardness is greater than that of black shale.
English name blackagate black agate. Mainly caused by the presence of more organic matter in the agate. The pure black agate is rare in nature, and is mostly characterized by different layers of organic matter.
Black onyx is generally transparent to opaque, with a refractive index of about 1.54, a specific gravity of 2.60, a hardness of 7, a glass luster, and a shell closure. The beautiful pattern with concentric ring-shaped, layered, corrugated, entangled, grass-like and other forms is the biggest artistic feature of black agate. The patterns are various in color, such as white, gray, yellowish brown, and black. Because black onyx has natural pores, it can also be dyed in various colors such as red, blue, green, yellow, and brown. The dyed black agate is called "umbu" in Brazil. Black agate has been widely used since ancient times. Ancient people often used "pearl agate" to describe wealth. Many foreign legends mentioned that black agate can bring happiness and confidence to the wearer and bring a dream. Black agate is a colloidal mineral. In mineralogy, it belongs to the chalcedony.
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