This arrangement of mineral species is based on Dana's New Mineralogy by Richard V. Gaines, H. Catherine Skinner, Eugene E. Foord, Brian Mason, and Abraham Rosenzweig, with sections by Vandall T. King, Illustrations by Eric Dowty, (ISBN: 047119310-0) Copyright © 1997, John Wiley & Sons, Inc.". This material is used by permission of John Wiley & Sons, Inc. Follow this link for a short discussion on the Dana Classification Number.
55.02 Sorosilicates Sorosilicate Si2O7 Groups, Generally with No Additional Anions with cations in [6] coordination 55.02.01a Thortveitite group 55.02.01a.01 Gittinsite CaZrSi2O7 C 2/m 2/m 55.02.01a.02 Keiviite-(Y) (Y,Yb)2Si2O7 C 2/m 2/m 55.02.01a.03 Keiviite-(Yb) (Yb,Y)2Si2O7 C 2/m 2/m 55.02.01a.04 Thortveitite (Sc,Y)2Si2O7 C 2/m 2/m 55.02.01b Thortveitite related species 55.02.01b.01 Rowlandite-(Y) Y4Fe++Si4O14F2 (?) None 55.02.01b.02 Thalenite-(Y) Y3Si3O10(OH) P 21/n 2/m 55.02.01b.03 Yttrialite-(Y) (Y,Th)2Si2O7 P 21/m 2/m 55.02.01b.04 Fluorthalenite-(Y)! Y3Si3O10F P 21/m 2/m 55.02.02 Keldyshite group 55.02.02.01 Keldyshite Na2-xHxZrSi2O7•n(H2O) P1 1 55.02.02.02 Khibinskite K2ZrSi2O7 B2/m 2/m 55.02.02.03 Parakeldyshite Na2ZrSi2O7 P1 1 55.02.03 55.02.03.01 Barysilite Pb8Mn(Si2O7)3 R 3c 3 2/m 55.02.04 55.02.04.01 Percleveite-(Ce)! (Ce,La,Nd)2Si2O7 P 41 4
55.02.01a Thortveitite group 55.02.01a.01 Gittinsite CaZrSi2O7 C 2/m 2/m 55.02.01a.02 Keiviite-(Y) (Y,Yb)2Si2O7 C 2/m 2/m 55.02.01a.03 Keiviite-(Yb) (Yb,Y)2Si2O7 C 2/m 2/m 55.02.01a.04 Thortveitite (Sc,Y)2Si2O7 C 2/m 2/m
55.02.01b Thortveitite related species 55.02.01b.01 Rowlandite-(Y) Y4Fe++Si4O14F2 (?) None 55.02.01b.02 Thalenite-(Y) Y3Si3O10(OH) P 21/n 2/m 55.02.01b.03 Yttrialite-(Y) (Y,Th)2Si2O7 P 21/m 2/m 55.02.01b.04 Fluorthalenite-(Y)! Y3Si3O10F P 21/m 2/m
55.02.02 Keldyshite group 55.02.02.01 Keldyshite Na2-xHxZrSi2O7•n(H2O) P1 1 55.02.02.02 Khibinskite K2ZrSi2O7 B2/m 2/m 55.02.02.03 Parakeldyshite Na2ZrSi2O7 P1 1
55.02.03 55.02.03.01 Barysilite Pb8Mn(Si2O7)3 R 3c 3 2/m
55.02.04 55.02.04.01 Percleveite-(Ce)! (Ce,La,Nd)2Si2O7 P 41 4