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Ferro-anthophyllite: [ ]Fe++7Si8O22(OH)2
Comments: TEM image showing a small percentage of Pnma ferroanthophyllite of similar composition is present as thin slabs intergrown parallel to (100) of grunerite and as individual µ-size crystals. Location: Rockport grunerite, Massachusetts, USA. (AmMin, v86:1252). Scale: See Image. © American Mineralogist