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.
55.04 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
55.04.01 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