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Poppiite: Ca2(V+++,Fe+++,Mg)(V+++,Al)2(Si,Al)3(O,OH)14
Comments: SEM micrograph of a poppiite crystal fragment (AmMin v91. p585). Location: Gambatesa mine, near the village of Reppia (Val Graveglia, Northern Apennines, Italy). Scale: See Image. © American Mineralogist