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Sewardite: CaFe+++2(AsO4)2(OH)2
Comments: Photomicrograph of an isolated fragment of red sewardite as well as a fragment in green to black botryoidal matrix. Location: Single specimen of gangue collected from the 31st level of the Tsumeb mine, Tsumeb, Namibia. Scale: See Image. © Canadian Mineralogist
Comments: Deep red, micaceous sewardite crystals mistakenly identified as carminite. Location: Benjamin Hill, Sonora, Mexico. Scale: Picture size 1 cm. © Tom Loomis / Dakota Matrix