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Dana Classification 8th edition - SOROSILICATES Si
2
O
7
Groups,Generally with no Additional Anions
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55.1
Si
2
O
7
Groups, Generally with no Additional Anions with cations in [4] and higher coordination
55.2
Si
2
O
7
Groups, Generally with no Additional Anions with cations in [6] coordination
55.3
Si
2
O
7
Groups, Generally with no Additional Anions with cations in [7] coordination
55.4
Si
2
O
7
Groups, Generally with No Additional Anions with cations in [8] and lower coordination
55.5
Si
2
O
7
Groups, Generally with No Additional Anions with dimeric cations
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