The spinels are a diverse group of minerals with wide variation in their chemical composition. Among the more common spinel group minerals, the color is due to chromium and iron. Rarely, cobalt will be a cause of color.

Visible Spectra (generally 350 - 2500 nm)

Natural Spinels

Synthetic Spinel-group materials

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

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