老挝水洞桃花石和高山桃花石的宝石学与谱学特征对比

doi:10.3964/j.issn.1000-0593(2020)09-2901-07

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Abstract Laos Peach-blossom Stone is popular for the similar appearance and quality to that of Gaoshan Peach-blossom Stone, one of the famous varieties in Shoushan Stone. The experimental methods used in this paper include Gem Microscope Observation, X-ray Powder Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Raman spectroscopy (LRM). Laos Peach-blossom Stone samples were tested by the experiment methods mentioned above for the mineral composition, infraredspectral characteristics, Raman spectral characteristics, impurity minerals composition and color genesis, and compared with the characteristics of Gaoshan Peach-blossom Stone. The main mineral composition of Laos Peach-blossom Stone is dickite-kaolinite transition minerals with high to a low degree of crystallization, part of which is dickite with good crystallinity. Laos Peach-blossom Stonecould also contain a small amount of quartz. The characteristic IR absorption peaks of the Laos Peach-blossom Stonein functional group region are at 3 697, 3 653 and 3 621 cm^-1, which related to the O—H stretching vibration. Its mineral composition is disordered dickite-kaolinite transition mineral. The characteristic IR absorption peaks ofthe Gaoshan Peach-blossom Stonein functional group region are at 3 702, 3 653, 3 621 cm^-1. The position and intensity of absorption peak indicate that the mineral composition of Gaoshan Peach-blossom Stoneis ordered-dickite. Laos Peach-blossom Stone and Gaoshan Peach-blossomshare the similar infrared spectral characteristics in the fingerprint area. Their infrared spectrum shows the stretching vibration absorption peak of Si—O and Al—OH at 1 106, 1 034 and 1 006 cm^-1 and the bending vibration caused by Al—OH generates at 937 and 913 cm^-1. The absorption peaks of Si—O—Al stretching vibration appear at 695 and 538 cm^-1as well as the absorption peaks caused by Si—O bending vibration appear at 471 and 430 cm^-1. In the Raman spectrum of the substrate of Laos Peach-blossom Stone, the peaks in the range of 200~1 000 cm^-1reveal the vibration characteristics of the kaolinite group minerals, of which peaks at 202 and 273 cm^-1 belong to the O—H stretching vibration. The peak at 341 cm^-1in the Raman spectrum belongs to Si—O vibration and peaks at 439 and 468 cm^-1 belong to Si—O bending vibration. Peaks of Al—O—Si bending vibration appear at 754 and 800 cm^-1 and peak of O—H bending vibration appear at 921 cm^-1. The O—H stretching vibration period during 3 550~3 750 cm^-1 in the Raman spectrum of Laos Peach-blossom Stone usually shows three peaks similar to that in the high frequency region in the infrared spectrum. The “Peach Blossom” inclusions in the Laos Peach-blossom Stone and Gaoshan Peach-blossom Stone both are hematite, whose typical Raman peaks appear at 225, 296, 411 and 1 318 cm^-1 in the spectrum. Moreover, Gaoshan Peach-blossom Stone also contains anatase, whose typical Raman peaks appear at 145 and 639 cm^-1 in the spectrum. Combined with the magnification observation results and chemical composition analysis, the microcrystalline hematite in Laos Peach-blossom Stone and Gaoshan Peach-blossom Stone make them red.

Key words：Laos Peach-blossom Stone; Gaoshan Peach-blossom Stone; XRD; FTIR spectrum; Raman spectrum; Color genesis

Received: 2019-08-28 Accepted: 2019-12-30

ZTFLH:

P575

Corresponding Authors: HEN Tao E-mail: summerjewelry@163.com

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http://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2020)09-2901-07 OR http://www.gpxygpfx.com/EN/Y2020/V40/I09/2901