High-pressure Cr3+ R-line luminescence of zoisite and kyanite: a probe of octahedral site distortion

The Cr 3+ luminescence spectra of zoisite and kyanite, two geologically important minerals, were studied up to 40 and 20 GPa, respectively, in various pressure media. Cr 3+ substitutes into the octahedral aluminum sites in both minerals and the R-line luminescence is a particularly sensitive site-sp...

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