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      4th class - Oxides and hydroxides. They consists of oxides and hydroxides of metals and nonmetals. Their categorization is based on the metal/oxygen ratio. The hydroxides are classificed mainly on the basis of the presence of OH and/or H₂O. Also arsenides (AsO₃), selenides (SeO₃), tellurides (TeO₃) and iodides (IO₃) belong to this class.

okr

No. of sample:	g1993
Mineral:	okr, MIN
Description:	jeden kus
Localization:	Černovice u Stříbra
Author:	leg. V. Čech,1950
Comment:

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