AM_Ribbeite Formula: Mn5 Si2 O10 H2 Name: Ribbeite Unit cell: 10.732 15.672 4.811 90.0 90.0 90.0 , V=809.17 Space group: PNMA (62)

Freed R L , Rouse R C , Peacor D R , American Mineralogist , 78 (1993) p.190-194, Ribbeite, a second example of edge-sharing silicate tetrahedra in the, leucophoenicite group