AM_Ussingite Formula: Al Si3 Na2 H O9 Name: Ussingite Unit cell: 7.256 7.686 8.683 90.75 99.75 122.48 , V=399.44 Space group: P-1 (2)

Rossi G , Tazzoli V , Ungaretti L , American Mineralogist , 59 (1974) p.335-340, The crystal structure of ussingite