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Fervanite: Fe+++4(VO4)4·5(H2O) Hewettite: CaV6O16·9(H2O)
Comments: Spherical aggregate of acicular microcrystals of fervanite with blocky hewettite. Location: Gold Quarry Mine, Carlin Trend, Eureka County, Nevada, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species