andradite
Nota de aplicación
A type of garnet composed of a calcium iron silicate. Colors include yellow, red, green, brown, and black. Gemstone quality andradite is mined in the Ural Mountains, Italy, Switzerland, Norway, France, and in the United States (Arkansas and New Jersey). It is valued because of its high dispersion (separation of light into colors), which is even greater than that of diamond, and refractive index.