1. M. Pasero, A. R. Kampf, C. Ferraris, I. V. Pekov, J. Rakovan, and T. J. White, Eur. J. Miner. 22, 163 (2010).
2. J. Gu, G. Y. Chao, and S. Tang, J. Wuhan Univ. Technol. 9 (3), 9 (1994).
3. I. I. Kupriyanova, G. A. Sidorenko, and M. A. Kudrina, Geol. Rare Element Deposits, No. 3, 9 (1966).
4. Z. V. Vasil’eva, in Composition and structure of minerals as indicators of their genesis (Moscow, 1978), pp. 109–124 [in Russian].
5. R. Oberti, L. Ottolini, G. Della Ventura, and G. C. Parodi, Am. Mineral. 86, 1066 (2001).