AM_Epidote_1 Formula: Ca2 Si3 Al2.17 Fe.81 O13 H Name: Epidote Unit cell: 8.914 5.64 10.162 90.0 115.4 90.0 , V=461.51 Space group: P121/M1 (11)

Dollase W A , American Mineralogist , 56 (1971) p.447-464, Refinement of the crystal structures of epidote, allanite and hancockite