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Protoanthophyllite: (Mg,Fe)7Si8O22(OH)2
Comments: Drill core showing white acicular crystalline aggregates of protoanthophyllite in matrix with a close up image on the right.. Location: Drill-core sample from the waste dump of the abandoned Takase chromite mine, Okayama Prefecture, Japan. Scale: Core size 3 cm. © American Mineralogist