Phase composition and color origin of Peru's pink opals
X-ray powder diffraction,infrared spectroscopy,electron microprobe,laser ablation inductively coupled plasma mass spectrometry and ultraviolet-visible spectrophotometer were used to test and analyze the phase composi-tion and color genesis of different shades of pink opal samples from Peru.The results show that the main mineral composition of pink opal is Opal-CT,palygorskite,quartz and water,and the type of water is rich,including crys-tal water,structural water and zeolite water.Combined with X-ray powder diffraction,electron microprobeand in-frared spectrum analysis,it is considered that the color of pink opal is related to palygorskite,and the content of palygorskite was quantitatively analyzed by XRD,which was positively correlated with color.UV-visible spectro-photometer combined with electron microprobe and laser ablation inductively coupled plasma mass spectrometry showed that the color of pink opal was related to the organic quinones,β-carotene and Mn2+,and the more the con-tent of Mn2+,the darker the color.At the same time,the effect of Fe3+on color was proposed,and it was found that Fe3+only appeared in dark samples.
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