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Dwornikite: (Ni,Fe++)SO4·(H2O)
Comments: Green earthy, powdery dwornikite on or replacing millerite as acicular crystals in 1cm vug. Location: Lipovka Ni deposit, Rezh District, Central Urals, Urals Region, Russia. Scale: Picture size 1.2 cm. © Tom Loomis / Dakota Matrix