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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, cinvaldit

No. of sample:	g9136
Mineral:	křemen, HOR
Description:	jeden kus /12x10cm/
Localization:	Cínovec, o. Teplice
Origin:	coll.V.Šafránek
Author:
Comment:	srostlice křemene s růžicovými agregáty cinvalditu

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