AM_Jimthompsonite
Formula: (Mg3.892 Fe1.108) Si6 (O18 H2)
Name: Jimthompsonite
Unit cell: 18.626 27.23 5.297 90.0 90.0 90.0 , V=2686.56
Space group: PBCA (61)

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