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Dana Classification 8th edition - SOROSILICATES Si₂O₇ Groups, With Additional O, OH, F and H₂O

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	56.1	Si₂O₇ Groups and O, OH, F, and H₂O with cations in [4] coordination
	56.2	Si₂O₇ Groups and O, OH, F, and H₂O with cations in [4] and/or >[4] coordination
	56.3	Si₂O₇ Groups and O, OH, F, and H₂O with[Si₂O₇] with borate groups
	56.4	Si₂O₇ Groups and O, OH, F, and H₂O with [Si₂O₇] with other cation groups
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