Ruby
| Ruby | |
|---|---|
 A ruby gemstone | |
| General | |
| Category | Corundum variety, Oxide mineral |
| Formula (repeating unit) | aluminium oxide with chromium, Al2O3 |
| Identification | |
| Color | Red shades |
| Luster | Vitreous |
| References | [1] |
A ruby is a kind of precious stone. It is often associated with emerald, sapphire and topaz.[1] It is usually red, but can sometimes be other colors.[1] It is formed of aluminum and oxygen (Al2O3),[1] and that means it's a kind of corundum. A small amount of chromium makes the color. They are the most popular red gemstone, and is aften linked with the birthmonth of July.
Ruby Media
The main ruby-producing countries
Crystal structure of rubies
Crystal structure of ruby showing the substitution of Al3+ ions (blue) with Cr3+ (red). The substitution density of Cr3+ ions in this model is approximately 2%, approximating the maximum doping normally encountered.
Transmittance of ruby in optical and near-IR spectra. Note the two broad violet and yellow-green absorption bands and one narrow absorption band at the wavelength of 694 nm, which is the wavelength of the ruby laser.
Ruby (Corundum) - Hunza Valley, div. Gilgit, Northern Areas, Pakistan.
Rubies at the National Museum of Natural History, Washington, D.C., USA
The Ruby Eye Amulet from Mesopotamia, Adilnor Collection, Sweden.
_-_Hunza_Valley,_div._Gilgit,_Northern_Areas,_Pakistan.jpg)
References
- ↑ 1.0 1.1 1.2 1.3 Ruby at MindatMindat.org. Retrieved 23 August 2013.
