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

55.04 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