Dana Sorosilicate Classification<br><small>Si2O7 Groups, Generally with No Additional Anions</small>

Dana Sorosilicate Classification
Si2O7 Groups, Generally with No Additional Anions
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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.

Note: Space Group in Red   Point Group in Green.
* - Not IMA Approved.

! - Dana Number Added or Changed.

? - IMA Discredited Mineral Name.

Dana Sorosilicate Classification
Si2O7 Groups, Generally with No Additional Anions

55.02 Sorosilicates Sorosilicate Si2O7 Groups, Generally with No Additional Anions with cations in [6] coordination

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