The space group and unit cell of yingjiangite from the Xiazhuasng ura- nium deposit, Guangdong Province, have been determined for the first time by single-crystal X-ray diffraction analysis.Its unit cell is orthorhombic, space group Bmmb (63)，a=15.707 (3)，b=17.424(3)，c=13.692(2)A. V = 3747A3.Z=4.Dc二4.60g/cm3, Dm=4.54 g/cm3.Chemical formula: (K2,Ca) (UO2)7(P04)4(OH)6·6 H2O.Biaxial negative with 2Vc=36°，2 Vm=36-38°， Ng=1.707(2)，Nm=1.703(2)，Np=1.666(1)·Optical oiientatiori: , Ng//Y, Nm//X and Np//Z.
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张静宜,万安娃,龚温书, 1992. 盈江铀矿的新资料[J]. 岩石矿物学杂志, 11(2):178~184. Zhang Jingyi, Wan Anwa, Gong Wenshu Beijing Institute of Geology for Nuclear Industry, et al, 1992. New Data on Yingjiangite[J]. Acta Petrologica et Mineralogica, 11(2): 178~184.
