Epidote is a member of the sorosilicate group. As such, it’s silicate backbone is made up of duotetrahedral silicate units; that is, two silicate tetrahedra are polymerized together by corner bonding. Epidote is monoclinic with a prismatic or tabular habit.
Highlighting FeaturesTetrahedrally-coordinated silicon (Si) atoms A duotetrahedral silica polymer Tetrahedrally-coordinated aluminum (Al) atoms Oxygen (O) atoms Single unit cell All atoms
Characteristically found in alpine regions.
Gabe, E. J., J.C. Portheine, S.H. Whitlow. 1973. A reinvestigation of the epidote structure: Confirmation of the iron location sample HEP. American Mineralogist. 58:218-223.