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Published online by Cambridge University Press: 05 July 2018
Santafeite, known only from New Mexico, USA, is re-examined using single-crystal X-ray and microprobe techniques. The new idealized formula, consistent with space group requirements, is
(Mn2+, Fe3+,Al,Mg)8(Mn4+, Mn2+)8 (Ca,Sr,Na)12[(VO4),(AsO4)]16(OH)20 · 8H2O.