AM_Hardystonite Formula: (Ca1.86 Na.14) Zn.85 Al.07 Mg.03 Mn.04 Fe.02 Si2 O7 Name: Hardystonite Unit cell: 7.8 7.8 5.0 90.0 90.0 90.0 , V=304.20 Space group: P-421M (113)

Bindi L , Bonazzi P , Rothlisberger F , American Mineralogist , 86 (2001) p.747-751, Hardystonite from Franklin Furnace: A natural modulated melilite