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Dana Classification 8th edition - SOROSILICATES Si2O7 Groups,Generally with no Additional Anions

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55.1Si2O7 Groups, Generally with no Additional Anions with cations in [4] and higher coordination
55.2Si2O7 Groups, Generally with no Additional Anions with cations in [6] coordination
55.3Si2O7 Groups, Generally with no Additional Anions with cations in [7] coordination
55.4Si2O7 Groups, Generally with No Additional Anions with cations in [8] and lower coordination
55.5Si2O7 Groups, Generally with No Additional Anions with dimeric cations
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