Citation: Owen P. Missen; Anthony R. Kampf; Stuart J. Mills; Robert M. Housley; John Spratt; Mark D. Welch; Mark F. Coolbaugh; Joe Marty; Marek Chorazewicz; Cristiano Ferraris (2019). The crystal structures of the mixed-valence tellurium oxysalts tlapallite, (Ca,Pb)3CaCu6[Te4+3Te6+O12]2(Te4+O3)2(SO4)2 . 3H2O, and carlfriesite, CaTe4+2Te6+O8. Mineralogical Magazine, 83, pp. 439-549.
Formula: Ca1.81 Cu3 H3 O20.5 Pb0.19 S Sb0.13 Te4.87