THE GEMSTONE GARNET
Garnet isn't one mineral, however, describes a gaggle of many closely connected minerals. Garnets are available a spread of colors and have many alternative varieties. However, the most widely-known color of Garnet gemstones is dark red. When the term "Garnet" is employed, it's typically connotative the red form; different color Garnets square measure typically given a lot of descriptive crystal terms.
The properties below are generic to all Garnets; see the specific Garnet gemstone pages for more precise details:
Color - RED, GREEN, YELLOW, PINK, PURPLE, GRAY, ORANGE, BLACK
Crystal system - Isometric
Transparency - Transparent to translucent
Mineral Class - Garnet
Almandine and garnet area unit the foremost wide used transparent gem gemstones. Though Almandine is the most common Garnet, it is usually opaque and not fit for gemstone use. Only the less common clear red varieties of Almandine area unit used as gemstones. Pyrope is very noted for its transparency and frequent lack of flaws or inclusions. Achromatic to the violet type of garnet (or treater between Almandine and Pyrope) is understood as garnet and is a very well represented in the gem trade. Spessartite is associate degree orange to orange-red kind of transparent gem and has recently increased in popularity, with several new deposits of gem grade material having been recently exploited. Grossular, the foremost varicolored kind of transparent gem, has the important gem variety of green Tsavorite, as well as orange-brown Hessonite and a yellow to yellow-green form.
Andradite, the foremost lustrous of the Garnets, has the rare green Demantoid variety, the yellow Topazolite variety, and the black Melanite variety. Uvarovite, the rarest of the acquainted garnets, is seldom found in crystals large enough to be faceted and is the least represented of all the familiar Garnets.
The color-changing transparent gem is a motivating kind of this gem that features a completely different color once viewed in natural and incandescent lighting. It will have many color combos, especially brown or orange in daylight to a pink or light red in incandescent light. Garnets often display asterism within the kind of four-rayed stars. However, Star Garnets area unit terribly rare, and usually occur in opaque stones with solely a weak asterism effect; therefore interest in Star Garnets area unit restricted.