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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.

křemen

No. of sample:	g8906
Mineral:	křemen, HOR
Description:	jeden kus /9x5cm/
Localization:	Habry, o. Havl. Brod, lom Peklo
Origin:	coll.V.Šafránek
Author:
Comment:	drúza sloupcovitých krystalů, nález 1950

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