Chalcedony is a kind of mineral, also known as "stone marrow". Chalcedony is actually a kind of quartz, the collective name of cryptoplast of SiO2, which is a variant of quartz (cryptocrystalline). How hard is the chalcedony?
The chalcedony has a hardness of about 6.5, a density of 2.58 to 2.64, and a refractive index of 1.53 to 1.54. Translucent to slightly transparent, glass luster to grease luster, good toughness, almost visible in a variety of colors.
Chalcedony is the most common jade species in nature and one of the oldest jade species in human history. As early as in the Neolithic Age, China has emerged as a decorative item, and it has been in the past for generations.
Common main colors: transparent to white is more common. There are also a handful of varieties that are bright and transparent in color.
The rest, such as red, green, blue, purple, etc., also have a small number of outputs, but because of the variety of gemstones of this color.
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