坦桑石的矿物学及谱学特征研究

doi:10.3964/j.issn.1000-0593(2018)09-2872-05

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Abstract In this paper, the Tanzanite samples from Merelani Tanzania have been respectively tested and analyzed by electron probe, EMXPLUS ESR spectrometer; SDT, UV VIS spectrometer and Fu Liye transform infrared spectrometer. The results show that: the Tanzanite samples are mainly composed of SiO₂, Al₂O₃ and CaO, V₂O₅ has the content of 0.36%, which is the most trace components; TG-DTA curves show that there is no absorption water and crystal water in Tanzanite samples, when being heated to 780 ℃, the structural water is lost, the water in the samples is about 2% of the total mass; ESR results shows obvious Fe³⁺ and Mn²⁺ electron paramagnetic signal; UV Vis spectra shows that an narrow- band absorption appears at 385 nm while a wide- band absorption appears respectively at 575 and 750 nm; infrared spectra shows that there is no absorption in 6 500~9 000 cm^-1 of the Tanzanite samples. The 5 956 cm^-1 is a wide absorption peak, and there is a sharp absorption peak respectively at 5 413, 5 184, 4 336, and 4 046 cm^-1, which are mainly caused by the O—H, the Si—O within in the minerals as well as H₂O and CO₂ inside the air environment. Based on the results of EPMA and ESR analysis, the color of blue-violet Tanzanite may be mainly caused by V³⁺ and V⁵⁺, d—d electron transition of the crystal field of Fe³⁺ and charge transfer of Fe²⁺ to Ti⁴⁺ to assist coloration.

Key words：Tanzanite; Spectroscopic characteristics; Color genesis; Mineralogical characteristics

Received: 2017-04-12 Accepted: 2017-10-15

ZTFLH:

O657.3

Corresponding Authors: ZHOU Zheng-yu E-mail: 06058@tongji.edu.cn

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2018)09-2872-05 OR https://www.gpxygpfx.com/EN/Y2018/V38/I09/2872