The History of Agate
Agate is a kind of chalcedony minerals. It is often a band-shaped block mixed with opal and cryptocrystalline quartz. It has a hardness of 7-7.5 degrees, a specific gravity of 2.65, and a fairly layered color. There are translucent or opaque. Often used as ornaments or for fun. Strings of agate balls are often seen in ancient funerals.
There are records that because the rough shape of agate is similar to horse brain, it is called "agate". Whether in the Old Testament or Buddhist scriptures, there are records of agate deeds. In the East, it is one of the seven treasures and seven treasures. It is especially important to note that agate is a crystal, but belongs to a cryptocrystalline structure, and the crystal is too small to be observed.
Agate is an ore of indefinite shape, usually in various colors such as red, black, yellow, green, blue, purple, gray, etc., and generally has a variety of layered and circular striped bands of different colors, similar to trees Of annual rings. Blue, purple, and green agates are relatively rare and are also known as "chalcedony". Agate is the bedrock of crystals. Many crystals are grown on agate ore. Like crystals, it is also a kind of silicon ore, and its chemical composition is silicon dioxide. Because of its high hardness, coupled with the immature technology and production technology of the past, an agate product is very expensive and not something ordinary people can have, but the image of the treasure is cherished and has been enduring since ancient times.
The history of agate is very remote. About 100 million years ago, underground magma spewed out due to changes in the earth's crust. When the lava cooled, vapor and other gases formed bubbles. Air bubbles are sealed up when the rock freezes, forming many holes. A long time later, the hole was immersed in a solution containing silica to condense into silica gel. The fusible components of the iron-bearing rock enter the silica gel, and finally the silica crystallizes as agate.
Refers to blue agate, also refers to agate with blue and white colors. This is a kind of agate with a very beautiful color, and the one with the highest degree of intensity is a good raw material for jade carving. Dark blue is the best color, and lighter color is the second.