The Garnet sources and optical properties

The garnet, ancient China, known as purple crow black or the Ziya black is a group in the Bronze Age has been used for precious stones and abrasive minerals. The common garnet red, but its kind of color is very broad enough to cover the entire spectrum of colors. Product garnet from the Latin, may be provided by the Punica granatum comes, it is a red-seed plants, similar to the shape, size and color are part of the garnet crystal. Common garnet in response to its chemical composition and recognized six types, namely pyrope, almandine, spessartine, andradite, calcium aluminum garnet (variant tsavorite and cinnamon Stone The) and uvarovite. Garnet formation of two solid solution series: 1. Pyrope - almandine - spessartine and 2. Uvarovite - grossular - andradite Stone.

Optical properties: different types of garnet have many different colors, including red, orange, yellow, green, blue, purple, brown, black, pink and transparent. One of the most rare blue garnet, in the late 1990s in Beiji Li, Madagascar, the first to be found. In addition, in parts of the United States, Russia and Turkey also disappeared. Because of the relationship between the high vanadium content, the color in incandescent light from blue-green to purple. Some other types of garnet has a color nature. In daylight, their color categories green, beige, brown, gray and blue; but in incandescent light, they appear pink, purple or pink. Because they turn color characteristics, such garnet is often mistaken for chrysoberyl. Opaque the lightwave transmission properties of a variety of garnet gem quality transparent samples to industrial abrasives have. The luster of the mineral can be classified into glass and resins.