湖南郴州铅磷灰石矿物光谱学特征

doi:10.3964/j.issn.1000-0593(2022)10-3017-07

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Abstract Recently a rare mineral of the Phosphohedyphane series was discovered in Hunan Province of China. It occurs in the clay adits above the Pb-Zn deposit, the Shizhuyuan, about 15 km east-south of Chenzhou. Determination of the mineral is difficult because its mineralogical and spectroscopic characteristics are similar to some phosphate minerals. Routine determinative procedures and spectroscopy analysis were carried out to investigate the mineral morphology, microstructure, spectroscopy features and partial chemical compositions of 4 samples. The crystals occur as subtransparent, yellow-green to bluish-green, the aggregate of micro-crystals. Crystal faces exhibit vitreous to greasy luster. The mineral has a Mohs hardness of approximately 4. The relative gravity is 4.487~5.331 g·cm³. The observation by stereoscopic microscope shows that crystals are hexagonal prisms, as individuals up to about 1 mm in length and ≤0.8 mm in diameter. Crystals occur in subparallel intergrowths and irregular clusters. The specimens’ infrared spectra show good agreement with Fluorphosphohedyphane. The vibration mode and frequency of PO^3-₄ determine the infrared spectrum’s main feature of samples. The phosphate ions’ asymmetry stretching vibrations appear at about 1 090/1 010 cm^-1 and their symmetry stretching vibrations appear at 934 cm^-1. Correspondingly, their bending vibrations appear at about 589/566/546 cm^-1 with weak spilt bands of CO^2-₃ and AsO^3-₄ from the infrared absorption spectroscopy. The Raman spectra analysis proves the phosphate ions stretching vibrations appear at about ~400/426 cm^-1 while the bending vibrations appear at ~558/586 cm^-1 with symmetric stretch at ~936/976 cm^-1and asymmetry vibration at about 1 060 cm^-1. Two Raman bands at ~170~214 cm^-1 are assigned to lattice vibration. In addition, there is a notable band of AsO^3-₄ at ~822 cm^-1 in the Raman spectra. The results of semi-qualitative chemical composition analysis by Energy Dispersive X-ray Fluorescence (EDXRF) show the main elements of Pb, Ca, PO and Cl, with trace elements of Cu, Fe, Zn, et al. The 2θ°, d-spacing, hkl and intensity of main Powder X-Ray Diffraction (XRD) lines are 10.603/22.351/28.261/31.047°, 8.336 5/3.974 4/3.155 3/2.878 2 Å, (100/111/210/211), 59.1/36.4/30.0/100 respectively. The samples’ d-spacing is smaller in comparison with Phosphohedyphane and closely matches Fluorphosphohedyphane’s. The integraded analysises of relative gravity, vibrational spectroscopy and XRD data prove that the 4 experimental samples are Fluorphosphohedyphane. The present paper is the first report on the discovery of Fluorphosphohedyphane from Chenzhou of Hunan Province, China. This provides an initial spectroscopy analysis on which to undertake further studies of chemical quantitative analysis, composition, or structural refinement work.

Key words：Chenzhou of hunan province; Phosphohedyphane; Spectroscopy analysis; Element; Diagnostic character

Received: 2021-07-29 Accepted: 2021-12-03

ZTFLH:

P575

Corresponding Authors: PENG Jun E-mail: pengjun6539@126.com

Cite this article:

ZHU Gui-jun,WANG Gan-zhen,PENG Jun, et al. The Mineralogical and Spectroscopic Characteristics of Phosphohedyphane From Chenzhou of Hunan Province[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(10): 3017-3023.

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http://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2022)10-3017-07 OR http://www.gpxygpfx.com/EN/Y2022/V42/I10/3017