Glitter: Gems or Gyps?
Division of Geological and Planetary
California Institute of Technoogy
Pasadena, CA 91125
The variations of color in minerals makes the difference between a
valuable gem and a worthless stone. So, naturally, there are many
ingenious ways to manipulate the color. A mineralogist describes some
of the pitfalls that can accompany artificially colored gemstones.
Comparision of the infrared spectra of natural and synthetic turquoise
last updated: 25-Jul-2022