Adv Search
Volume 19 Issue 1
Sep.  2021
Turn off MathJax
Article Contents
Abstract
References
JIANG Jiali, CHEN Meihua, REN Qianqian. Colour Change of Colourless-Yellowish Scapolite by Electron Irradiation and Heat Treatment[J]. Journal of Gems & Gemmology, 2017, 19(1): 22-29. DOI: 10.15964/j.cnki.027jgg.2017.01.004
Citation: JIANG Jiali, CHEN Meihua, REN Qianqian. Colour Change of Colourless-Yellowish Scapolite by Electron Irradiation and Heat Treatment[J]. Journal of Gems & Gemmology, 2017, 19(1): 22-29. DOI: 10.15964/j.cnki.027jgg.2017.01.004
shu

Colour Change of Colourless-Yellowish Scapolite by Electron Irradiation and Heat Treatment

  • Gemmological Institute, China University of Geosciences, Wuhan 430074, China

More Information
  • Received Date: October 08, 2016
    Graphical Abstract
    • Abstract
  • Natural colurless-yellowish scapolite effected by electron beam irradiation and heat treatment were investigated.After electron irradiation, some scapolites turned into purple, and showed a wide absorption band in the green-yellow region.Some other samples turned into more saturated yellow after being irradiated, and the position of the absorption peaks in the UV-Vis absorption spectra were similar with natural scapolite, but with a higher absorbance in purple-blue region.The UV-Vis spectra indicated that the purple colour of irradiated scapolite might have the same genesis as natural purple scapolite, whereas the yellow colour of irraidated scapolite might cause by O- hole center.The results of heat treatment indicated that heating to 500℃ and holding for 2 hours in reducing atmosphere could not reduce the brown hue of irradiated scapolite, while subjected to 600℃ for 2 hours or 4 hours in reducing atmosphere could make the samples fade.The atmosphere of heat treatment does not produce big difference to the colour change.
    • FullText(HTML)
    • References (28)
  • [1]
    张蓓莉.系统宝石学[M].2版.北京:地质出版社, 2012:333-335.
    [2]
    李娅莉, 薛秦芳, 李立平, 等.宝石学教程[M].2版.武汉:中国地质大学出版社, 2010:319-310.
    [3]
    Shaw D M.The geochemistry of scapolite Part I, previous work and general mineralogy[J].Petrology, 1960, 1(2):218-260.
    [4]
    Ulbrich H H.Crystallographic data and refractive indices of scapolites[J].American Mineralogist, 1973(58):81-92.
    [5]
    Teertstra, Schindler D K, Sherriff M, eat al.Silvialite, a new sulfate-dominant member of the scapolite group with an Al-Si composition near the I4/m-P42/n phase transition[J].Mineralogical Magazine, 1999, 63(3):321-329.
    [6]
    Sidike A, Kusachi I, Kobayashi S, et al.Photoluminescence spectra of S2-center in natural and heat-treated scapolite[J].Phy Chem Minerals, 2008, 35(3):137-145.
    [7]
    Levien L, Papike J J.Scapolite crystal chemistry:Aluminum-silicon distribution, carbonate group disorder, and thermal expansion[J].American Mineralogist, 1976(63):864-877.
    [8]
    Sokolova E, Hawthorne F C.The crystal chemistry of the scapolite-group minerals.l.Crystal structure and long-range order[J].The Canadian Mineralogist, 2008, 46(6):1527-1554.
    [9]
    Seto Y, Shimobayashi N, Miyake K.Composition and I4/m-P42/n phase transition in scapolite solid solution[J].American Mineralogist, 1999(89):257-265.
    [10]
    Swayze G A, Clark R N.Infrared spectra and crystal chemistry of scapolites:Implications for Martian mineralogy[J].Journal of Geophysical Research, 1990, 95(B9):14481-14495.
    [11]
    赵珊茸.结晶学及矿物学[M].2版.北京:高等教育出版社, 2011:339-340.
    [12]
    Superchi M, Pezzotia F, Gambini E, et al.Yellow scapolite from Ihosy, Madagascar[J].Gems & Gemology, 2010, 46(4):274-279.
    [13]
    Choudhary G.Zoned scapolite from India[J].Gems & Gemology,2013,49(1).
    [14]
    汪立今.新疆某地宝石级方柱石的初步研究[J].新疆工学院报, 1994, 15(2):150-154.
    [15]
    钟华邦.新疆的宝石级方柱石[J].宝石和宝石学杂志, 2003, 5(3):35.
    [16]
    Nassau K.Gemstone enhancement:Heat, irradiation, impregnation, dyeing, and other treatments which alter the appearance of gemstones, and the detection of such treatments[M].London:Butterworths, 1985.
    [17]
    Charles E A.Gemstone irradiation and radioactivity[J].Gems & Gemology, 1988, 24(4):196-213.
    [18]
    汪立今, 何金明.新疆产宝石级方柱石基本特征及改色工艺实验研究[J].矿物学报, 2001, 21(3):519-520.
    [19]
    任芊芊, 陈美华, 李新宇.浅黄色方柱石化学成分及热处理结果分析[J].宝石和宝石学杂志, 2016, 18(2):34-39.
    [20]
    Burns R G.Mineralogical applications of crystal field theory[M].Cambridge:Great Britain at the University Press, 1993:222-226.
    [21]
    Hofmeister A M, Rossman G R.Determination of Fe3+and Fe2+ concentrations in feldspar by optical absorption and EPR spectroscopy[J].Physics & Chemistry of Minerals, 1984, 11(5):213-224.
    [22]
    曹越.内蒙古自治区固阳县长石及其颜色改善研究[D].北京:中国地质大学, 2006.
    [23]
    Michael S, Krzemnicki.Red and green labradorite feldspar from Congo[J].Gems & Gemology, 2004, 29(1):15-23.
    [24]
    Choudhary G.Purple scapolite[J].Gems & Gemology, 2015, 51(2).
    [25]
    Moon A R, Phillops M R.Defect clustering and color in Fe, Ti:α-Al2O3[J].Journal of the American Ceramic Society, 1994, 77(2):356-367.
    [26]
    Ahn Y, Seo J, Park J.Electronic and vibrational spectra of tourmaline-The impact of electron beam irradiation and heat treatment[J].Vibrational Spectroscopy, 2013(65):165-175.
    [27]
    Krambrock K, Pinheiro M V B, Medeiro S M, et al.Correlation of irradiation-induced yellow color with the O- hole center in tourmaline[J].Phys Chem Minerals, 2004, 31(3):168-175.
    [28]
    Speit B, Lehmann G.Radiation defects in feldspars[J].Physics & Chemistry of Minerals, 1982, 8(2):77-82.
    • Related Articles

Catalog

    Get Citation
    PDF
    XML

    Article Metrics

    Article views (355) PDF downloads (37) Cited by()
    Related
    Email alert RSS
    二维码

    Supported by Beijing Renhe Information Technology Co., Ltd.  Baidu Analytics

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return