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Dana Classification 8th edition - MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM

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	8.1	ABO₄
	8.2	A₂B₂O₆(O,OH,F)
	8.3	AB₂O₆
	8.4	A₂B₃O₉
	8.5	AB₂₁O₃₈
	8.6	(AB)₆O₁₁·nH₂O
	8.7	Miscellaneous
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