Quartz Varieties Visible Spectra (generally 350 - 1100 nm)

The color of some varieties of quartz, SiO2, comes from metal ions substututing either for silicon in the quartz structure, or in an site normally unoccupied by ions (interstitial sites). In many of the varieties, the color comes from small inclusions of other phases.

Link to an extensive collection of references to mostly color and visible spectroscopy of quartz

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