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Xonotlite: Ca6Si6O17(OH)2
Comments: White fibrous crystals of xonotlite to 1mm in a vug. Location: Christmas mine, Gila Co., Arizona, United States. Scale: Picture size 5 mm. © Tom Loomis / Dakota Matrix
Comments: Tufts of hair-like Xonotlite crystals on datolite rich matrix. Location: Kalahari Manganese Field, Kuruman Hills, Cape Province, South Africa. Scale: 5.5 x 3.7 cm. © John Veevaert