Ruby
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.
| 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] |
Ruby Media
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.
Rubies at the National Museum of Natural History, Washington, D.C., USA
The Ruby Eye Amulet from Mesopotamia, Adilnor Collection, Sweden.
References
- ↑ 1.0 1.1 1.2 1.3 "Ruby at Mindat". Mindat.org. Retrieved 23 August 2013.
