The impact of trace metal cations and absorbed water on colour transition of turquoise
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DOI: 10.1098/rsos.201110
Abstract: Thirty-five gem-quality turquoise samples with various colours were investigated using energy-dispersive X-ray fluorescence spectroscopy, ultraviolet–visible spectroscopy, Fourier-transform infrared spectroscopy and scanning electron microscopy. Sample chemical and spectral analyses indicate that Fe3+ contributes to green hue… read more here.
Keywords: absorption; absorbed water; colour; spectroscopy ... See more keywords