"Ustarasite was defined by Sakharova (1955) on the basis of chemical analysis and X-ray powder data. The mineral is compositionally close to synthetic Phase V of Otto & Strunz (1968), which is ∼PbBi4S7 (lillianite–pavonite super-family). Unit-cell data are needed to validate ustarasite." (Moëlo et al., 2008).
