The opal is a hydrate of silica, the composition is SiO2?nH2O, amorphous structure, is a very beautiful gemstone, the opal has no certain shape, the fracture is shell-like, mainly formed by the colloidal precipitation of silica. If precipitated in the biological remains, a "tree jade" is formed. Opal can be divided into several different types according to its color. Let's take a look at the opal category.
Classification of opals
According to color characteristics and optical effects, natural Opal is divided into three categories: white opal (white opal), black opal (black gull) and fire opal (fire opal).
1. White Opal
As a gemstone has a long history, its basic colors are colorless, egg white, light gray, light yellow and light purple. After honing into a curved gemstone, the surface will show beautiful color. The bottom color is white, and the color is brighter.
2, Black Opal
It was known only after being discovered by Australians in the 20th century. Its color is black, dark green, dark blue, dark gray and brown, and black is the best. The surface of Black Opal has a lot of color, and it is particularly bright and dazzling against the dark black background.
3, fire opal
It is a special variety in Opal. It is translucent to fully transparent and has a yellow and orange color. Since the diameter of the silica pellets constituting it is too small, it does not have a color change effect and belongs to a low-grade gemstone.
Distribution: Filling holes in caverns or ore in igneous rocks, forming stalagmites or stalactites, and replacing organic matter in fossil wood, animal hard shells and callus. Australia has been a major producer of opals since the 19th century. Others are the Czech Republic, the United States, Brazil, Mexico and South Africa.
The composition and value of opal
Opal is unique in its color and luster. Its rainbow-like brilliance is colorful and mosaic-like, full of mystery, and is unmatched by other gems.
Although it is called opal, it is not a single color. If it is only white, it has no value. Transparent, red, yellow color, mostly white and blue in Australia, one of which is dark like peacock feathers, called black opal, very beautiful, so the price is particularly high.
2. Opal is a gemstone containing silicic acid. Can bloom like a rainbow, the price is high. As a result of electron microscopic observation of the opal, it can be found that the particles containing carbon dioxide inside are arranged neatly and densely, and the voids of the particles contain water. When the light is incident, it is decomposed into seven colors. The rainbow is beautiful and shining. People have been using Sloem stone, a hard artificial glass to imitate opal. In 1973, Gilson created imitation opals in the laboratory.
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