AM_Chesterite Formula: (Mg12.82 Fe4.18) Si20 O60 H6 Name: Chesterite Unit cell: 18.614 45.306 5.297 90.0 90.0 90.0 , V=4467.10 Space group: A21MA (36)

Veblen D R , Burnham C W , American Mineralogist , 63 (1978) p.1053-1073, New biopyriboles from Chester, Vermont: II. The crystal chemistry of, jimthompsonite, clinojimthompsonite, and chesterite, and the amphibole-mica, reaction