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Santafeite: (Mn,Fe,Al,Mg)2(Mn++++,Mn++)2(Ca,Sr,Na)3(VO4,AsO4)4(OH)3·2(H2O)
Comments: Brownish-black silky santafeite in rusty quartz. Location: Monument Valley, Navajo County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species