• Spectroscopy and Spectral Analysis
  • Vol. 41, Issue 1, 292 (2021)
Lu-lu DAI1、1、*, Yan JIANG1、1, and Ming-xing YANG1、1
Author Affiliations
  • 1[in Chinese]
  • 11. Gemmological Institue, China University of Geosciences, Wuhan 430074, China
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    DOI: 10.3964/j.issn.1000-0593(2021)01-0292-07 Cite this Article
    Lu-lu DAI, Yan JIANG, Ming-xing YANG. Study on the Spectral Identification Characteristics of “Heiqing” and “Heibi”[J]. Spectroscopy and Spectral Analysis, 2021, 41(1): 292 Copy Citation Text show less

    Abstract

    “Heiqing” refers to dolomite-related nephrite with the color of the nearly black whose main component is tremolite. “Heibi” refers to serpentinite-related nephrite with the color of the nearly black whose main component is actinolite. EPMA, LA-ICP-MS and FTIR spectrum were applied to obtain the mineral species of “Heiqing” and “Heibi”. Raman spectrum, Micro-UV-Visible spectrophotometer and FTIR spectrum were used to investigate the spectral identification characteristics of “Heiqing” and “Heibi”. “Heiqing” have the standard tremolite peak position, and main peak positions of “Heibi” have several wavenumber deviations, which move in the direction of small wavenumber. In visible-near infrared band “Heiqing” appear 445 nm absorption peak and 680, 940nm wide absorption band, which were attributed to the role of Fe2+ and Fe3+; “Heibi” appears 445 nm absorption peak, 660, 690 nm double absorption peak and 970 nm , which were attributed to the role of Fe2+ and Fe3+, Cr3+. The near-infrared region of the samples can be analyzed by Micro-UV-Visible spectrophotometer. The strong absorption peaks of “Heiqing” appear at 1 397, 2 310, 2 387 and 2 466 nm, and the weak absorption peaks appear 1 915 and 2 120 nm; The absorption peaks of “Heibi” appear at 1 400, 2313 and 2 394 nm. The results of FTIR spectrum indicates that the absorption peaks of “Heiqing” were at 5 225, 4 738, 4 692, 4 349, 4 317, 4 190, 4 064 cm-1and the absorption peaks of “Heibi” were at 4 708, 4 307, 4 178 and 4 031 cm-1. Although there aresome small differences between the results of Microscopic UV-Visible spectrum and FTTR spectrum analysis, the results are basically consistent, the results of FTIR spectrum analysis shall prevail. By comparing “Heiqing”, “Heibi” and actinolite jade of Dahua, the near-infrared spectrum identification characteristics of “Heiqing”(tremolite) and “Heibi”(actinolite) are “Heiqing”(Tremolite) have two absorption peaks at 4 800~4 600 cm-1, and split double absorption peaks at 4 350~4 300 cm-1. “Heibi”(actinolite) have a weak absorption peak at 4 800~4 600 cm-1, and a single absorption peak at 4 350~4 300 cm-1. Moreover, the whole near-infrared absorption peaks of “Heibi” (actinolite) moves in the direction of smaller wavenumber than “Heiqing” (Tremolite).
    Lu-lu DAI, Yan JIANG, Ming-xing YANG. Study on the Spectral Identification Characteristics of “Heiqing” and “Heibi”[J]. Spectroscopy and Spectral Analysis, 2021, 41(1): 292
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