Diopside Spectra

Section in Diopside macro crystal (origin Brazil). Some regions are colorless, they contain only Mg2+ and Fe2+. Some other places are green colored, they contain also Cr3+ impurities.

Spectra recorded on the green spots of the section are characteristic of Cr3+ : two absorption bands are present in the visible range: one between 600 and 700 nm and one around 400 nm. The band in the NIR around 1050 nm is due to crystal field transition in Fe2+ ions. This iron band is mainly developed in colorless regions.

Above: Spectra recorded on the green spots with the first grating only.

Below: spectra recorded on a colorless crystal with both gratings.

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