Citation: Kampf, A. R.; Mills, S. J.; Housley, R. M.; Rossman, G. R.; Marty, J.; Thorne, B. (2013). Lead-tellurium oxysalts from Otto Mountain near Baker, California: XI. Eckhardite, (Ca,Pb)Cu2+Te6+O5(H2O), a new mineral with HCP stair-step layers. American Mineralogist, 98, pp. 1617-1623.