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Manganohornesite: (Mn,Mg)3(AsO4)2·8(H2O)
Comments: Micro, white, needles of manganese-hornesite to about 0.75mm on hausmannite-rich matrix. Location: Langban, Varmland, Sweden. Scale: 5.5 x 4 x 2.5cm. © Tom Loomis / Dakota Matrix