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Peretti, A.; Villa, I.M.; Bieri, W.; Hametner, K.; Dorta, L.; Fontaine, G.; Meier, M.; Günther, D. (2011). Distinguishing natural Tibetan copper-bearing andesine from its diffusion-treated counterparts using advanced analytical methods. Contributions to Gemology: Vol. 10. GRS Gemresearch Swisslab
