Laser & Optoelectronics Progress, Volume. 58, Issue 15, 1516029(2021)

Spectroscopic Characteristics and Coloring Mechanism of Green Kyanite

Xiaoxu Yan1, Suwei Yue1,2、*, and Lü Xinyi1
Author Affiliations
  • 1Shool of Jewelry, Guangzhou City Institute of Technology, Guangzhou , Guangdong 510800, China
  • 2Institute of Jewelry, Guangzhou City Institute of Technology, Guangzhou , Guangdong 510800, China
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    Figures & Tables(7)
    Feature of green kyanite samples
    Characteristics of Mid FT-IR spectra in green kyanite from different directions. (a) Perpendicular to c axis; (b) parallel to c axis; (c) k-1; (d) k-2; (e) k-3; (f) k-4
    Characteristics of UV-VIS spectra in green kyanite from different directions. (a) Perpendicular to c axis; (b) parallel to c axis
    Characteristics of EPR spectra in green kyanite from different directions. (a) k-1; (b) k-2
    • Table 1. Standard gemological characteristics of green kyanite

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      Table 1. Standard gemological characteristics of green kyanite

      SampleWeight /gColorTransparencyLusterRefractanceBirefringence
      c axisc axisc axisc axis
      k-13.72GreenSemi-transparentGlassy1.722‒1.7321.712‒1.7300.0100.018
      k-25.63GreenSemi-transparentGlassy1.720‒1.7301.715‒1.7300.0100.015
      k-32.88GreenSemi-transparentGlassy1.718‒1.7301.718‒1.7280.0120.010
      k-49.23GreenSemi-transparentGlassy1.718‒1.7281.715‒1.7300.0100.015
    • Table 2. Component of sample k-1 with XRF

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      Table 2. Component of sample k-1 with XRF

      ComponentPercentage of mass /%Relative molecular massAmount of substance /molMeMe f.uCationic valence state
      Al2O362.500101.960.6131.2261.99385.9815
      SiO236.00060.080.59920.59920.97453.8979
      Fe2O30.958159.680.0060.0120.01950.0585
      FeO0.35271.840.00490.00490.00800.0159
      CaO0.10056.080.00180.00180.00290.0059
      Cr2O30.050151.990.00030.00070.00110.0034
      ZrO20.010107.220.00010.00010.00020.0007
      Total99.9701.84473.00009.9639
    • Table 3. Mid-infrared absorption spectrum characteristics and peak assignment of green kyanite

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      Table 3. Mid-infrared absorption spectrum characteristics and peak assignment of green kyanite

      ">Absorption of kyanite samples /cm-1Arrangement of absorptionStandard absorption /cm-1
      k-1k-2k-3k-4
      cccccccc
      1035(s)1028(s)1040(s)1028(s)1040(s)1028(s)1040(s)1028(s)νs(Si―O―Si)1024
      979(s)975(s)979(s)975(s)979(s)975(s)979(s)975(s)976
      936(w)943(sh)937(m)943(sh)937(m)943(sh)937(m)943(sh)
      894(m)900(w)895(m)900(w)895(m)900(w)895(m)900(w)899
      756(w)759(w)756(sh)759(w)756(sh)759(w)756(sh)759(w)γ(O―Si―O)761
      726(w)730(w)728(m)730(w)728(m)730(w)728(m)730(w)731
      694(m)690(w)696(m)690(w)696(m)690(w)696(m)690(w)692
      672(w)674(sh)672(m)674(w)672(m)674(w)672(m)674(w)675
      641(m)640(m)641(m)640(m)641(m)640(m)641(m)640(m)640
      623(w)623(m)624(w)623(m)624(w)623(m)624(w)623(m)623
      589(s)596(w)590(s)596(w)590(s)596(w)590(s)596(w)592
      568(m)568(m)568(m)568(m)combined vibration of γ(O―Si―O) and δ(Al―O)
      545(w)545(w)545(m)545(w)545(m)545(w)545(m)545(w)545
      529(sh)528(w)529(w)528(sh)529(sh)528(sh)529(sh)528(w)527
      518(w)518(sh)518(w)518(w)518(w)518(w)518(w)516
      505(sh)505(sh)505(sh)505(sh)505(sh)
      488(w)490(w)488(w)488(w)488(w)
      468(w)468(m)471(w)468(m)468(w)468(m)468(w)468(m)470
      440(s)442(w)442(s)442(w)442(s)442(w)442(s)442(w)434
      432(w)432(sh)432(sh)432(sh)
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    Xiaoxu Yan, Suwei Yue, Lü Xinyi. Spectroscopic Characteristics and Coloring Mechanism of Green Kyanite[J]. Laser & Optoelectronics Progress, 2021, 58(15): 1516029

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    Paper Information

    Category: Materials

    Received: Jan. 8, 2021

    Accepted: Feb. 5, 2021

    Published Online: Aug. 6, 2021

    The Author Email: Suwei Yue (yuesuwei@gcu.edu.cn)

    DOI:10.3788/LOP202158.1516029

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