秘鲁粉色蛋白石的物相组成及颜色成因OA北大核心CSTPCD

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.