[1] A Hänni H, S Krzemnicki M. The Journal of Gemmology, 28, 417(2003).
[4] Wangjiao Hao, Jianjun Li, Yuan Sun et al. Gems & Gemology, 45, 197(2009).
[6] K Nassau, L Wood D. American Mineralogist, 53, 801(1968).
[1] A Hänni H, S Krzemnicki M. The Journal of Gemmology, 28, 417(2003).
[4] Wangjiao Hao, Jianjun Li, Yuan Sun et al. Gems & Gemology, 45, 197(2009).
[6] K Nassau, L Wood D. American Mineralogist, 53, 801(1968).
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