[1] Adolf P, Karl S[D]. Gems & Gemology, 1, 17(1999).

[5] Pezzotti G, Zhu W[D]. Journal of Raman Spectroscopy, 42, 2015(2011).

[6] Krishnan R S, Porto S P S[D]. The Journal of Chemical Physics, 3, 1009(1967).

[7] Tarte P[D]. Spectrochimica Acta Part A: Molecular Spectroscopy, 23, 2127(1967).

[9] Moon A R, Phillips M R[D]. Journal of Physics and Chemistry of Solids, 52, 1087(1991).

[10] Moon A R, Phillips M R[D]. Journal of the American Ceramic Society, 77, 356(1994).

[11] Balan E[D]. European Journal of Mineralogy, 32, 457(2020).

[12] Digne M et al[D]. Journal of Physical Chemistry B, 106, 5155(2002).

[14] Harder H, Lehman G[D]. American Mineralogist, 98(1970).

[15] Bhatt B C, Dhabekar B C, Page P S et al[D]. Journal of Luminescence, 130, 882(2010).