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Hydroastrophyllite: (H3O,K)2Ca(Fe+++,Mn)5-6Ti2Si8O26(OH)4F
Comments: Spray of brown hydroastrophyllite in alkaline granite pegmatite matrix. Location: Western Keivy Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture Size 12x9 mm. © Pavel M. Kartashov