AM_Gittinsite
Formula: Zr Ca Si2 O7
Name: Gittinsite
Unit cell: 6.852 8.659 4.686 90.0 101.69 90.0 , V=272.26
Space group: C121 (5)

Roelofsen-Ahl J N , Peterson R C , The Canadian Mineralogist , 27 (1989) p.703-708, Gittinsite: A modification of the thortveitite structure