Dana Sorosilicate Classification
Si2O7 Groups, Generally with No Additional Anions

Minerals Arranged by the New Dana Classification

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.

Dana Sorosilicate Classification
Si2O7 Groups, Generally with No Additional Anions

55 Sorosilicate Minerals

55.00 Sorosilicate Minerals Without Dana Classification Numbers

55.00.00 Silicate, Unclassified

55.00.00.00 IMA2009-011 Ba3Na(Fe++,Mn)8Ti4(Si2O7)4O4(OH,F)7 C1 1

55.01 Sorosilicates Sorosilicate Si2O7 Groups, Generally with No Additional Anions with cations in [4] and higher coordination

55.01.01

55.01.01.01 Barylite BaBe2Si2O7 Pn21a mm2

55.01.02

55.01.02.01 Clinobarylite! BaBe2Si2O7 Pmn2 2/m 2/m 2/m

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

55.03 Sorosilicates Sorosilicate Si2O7 Groups, Generally with No Additional Anions with cations in [7] coordination

55.03.01

55.03.01.01 Rankinite Ca3Si2O7 P 2₁/a 2/m

55.03.02

55.03.02.01 Jaffeite Ca4(Si3O7)(OH)6 P 3 3

55.04 Sorosilicates Sorosilicate Si2O7 Groups, Generally with No Additional Anions with cations in [8] and lower coordination

55.04.01 Melilite group

55.04.01.01 Akermanite Ca2MgSi2O7 P 42₁m 4 2m

55.04.01.02 Gehlenite Ca2Al(AlSi)O7 P 42₁m 4 2m

55.04.01.03 Melilite (Ca,Na)2(Al,Mg,Fe++)(Si,Al)2O7 P 42₁m 4 2m

55.04.01.04 Okayamalite! Ca2B2SiO7 P 42₁m 4 2m

55.04.01.05 Alumoakermanite! (Ca,Na)2(Al,Mg,Fe++)(Si2O7) P 42₁m 4 2m

55.04.02 Fresnoite group

55.04.02.01 Fresnoite Ba2TiSi2O8 P 4bm 4mm

55.04.02.02 Hardystonite Ca2ZnSi2O7 P 42₁m 4 2m

55.04.02.03 Jeffreyite (Ca,Na)2(Be,Al)Si2(O,OH)7 C 222₁ 2 2 2

55.04.02.04 Leucophanite (Na,Ca)2BeSi2(O,OH,F)7 P1 1

55.04.02.05 Meliphanite (Ca,Na)2Be[(Si,Al)2O6(F,OH)] I 4 4

55.04.02.06 Gugiaite Ca2BeSi2O7 P 42₁m 4 2m

55.04.03

55.04.03.01 Belkovite! Ba3(Nb,Ti)6(Si2O7)2O12 P 62m 6 m2

55.04.04

55.04.04.01 Stavelotite-(La)! La3Mn++3Cu++(Mn+++,Fe+++,Mn++++)26(Si2O7)6O30 P 3₁ 3

55.04.05

55.04.05.01 Batisivite! (Ti,V,Cr)14Ba[Si2O7]O22 P1 1

55.05 Sorosilicates Sorosilicate Si2O7 Groups, Generally with No Additional Anions with dimeric cations

55.05.01

55.05.01.01 Edgarbaileyite Hg+6Si2O7 C 2/m 2/m