Cat's eye, which is "cat's eye", "cat's eye", "cat". Opal, also known as the Oriental Cat's Eye, is a rare and precious variety in jewelry. Because the opal shows the same light phenomenon as the cat's eyes, it is flexible and bright, and can change with the intensity of light, hence the name. This optical effect is called the "cat eye effect."
There are many gemstones with cat eye effects. The gemological world refers to the gold emerald with cat's eye effect as the opal. The opal stone is generally referred to as the golden green cat's eye gemstone, while other gemstones with cat's eye effect must be preceded by the word "cat's eye". Names such as aquamarine cat eyes, tourmaline cat eyes, etc.
Strictly speaking, "cat's eye" is not the name of a gem, but an optical phenomenon on certain gemstones. That is, when a gemstone that has been ground into a hemispherical shape is illuminated with strong light, a thin and bright reflection will appear on the surface, which is called "cat's eye flash" or "cat's eye light", and then it is named according to what the gem is. If the gem is quartz, it is called "Quartz Cat Eye", if it is a gold emerald, it is called "Golden Green Cat Eye." There may be many types of gemstones that may have a cat's eye flash. According to statistics, there may be as many as 30 kinds. In addition to the quartz cat's eye and the golden-green cat's eye, there are also "Gemstone Cat's Eye" and "Aquamarine Cat's Eye". Because the golden green cat's eye is the most famous and most precious, it is also referred to as "cat's eye" in the habit. Other cat eyes cannot be called.
In the mineralogy, opal is a kind of gold emerald (Chrysoberyl), belonging to the gold emerald mineral. Gold emerald is a bismuth-containing aluminum oxide with a chemical formula of BeAl2O4. It is an orthorhombic system. The crystal form is often short columnar or plate-like. Opal has a variety of colors, such as honey yellow, brown yellow, wine yellow, brown yellow, yellow green, yellow brown, gray green, etc., among which honey yellow is the most expensive. Transparent to translucent. Glass to grease luster. The refractive index is 1.746-1.755, and the birefringence is 0.008-0.010. The dichroism is obvious, the dispersion is 0.015, and it is heterogeneous. Hardness 8.5, density 3.71-3.75 g / cm3. Shell-shaped fracture.
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