gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1986.050.356.16 Mineralogy Santafeite, a Re-Examination and New Empirical Formula Dunn Pete J. Department of Mineral Sciences, Smithsonian Institution, Washington, DC 20560, USA Peacor Donald R. Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109, USA 6 1986 50 356 299 300 19 8 1985 21 10 1985 Copyright © 1986, The Mineralogical Society 1986 Abstract

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.

 Keywords santafeite vanadates manganese New Mexico