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Tumuklu, A., Gumus, H., Sen, S. (2008) Role of trace elements in natural amethysts in colouring. Asian Journal of Chemistry: 20: 4138-4140
Dedushenko, S.K., Makhina, I.B., Mar'in, A.A., Mukhanov, V.A., Perfiliev, Y.D. (2004) What oxidation state of iron determines the amethyst colour? Hyperfine Interactions: 156/157: 417-422.
Pan, Y., Nilges, M.J., Mashkovtsev, R.I. (2008) Radiation-induced defects in quartz. II. Single-crystal W-band EPR study of a natural citrine quartz. Physics and Chemistry of Minerals: 35: 387-397.
fc622ccd1fa9fdacb87822ff522422e4392b.pdf
RoleofTraceElementsinNaturalAmethystsinColouring.pdf
PNM_PCM_7_08.pdf