One level back to Salts 2.2.3.3.3.3.1. [Metal with non-metals or semi-metals] 2.2.3.3.3.3.1.1. [Sulphides] (metal sulphur: pyrite, cinnabar, galena, etc.) 2.2.3.3.3.3.1.2. [Halides] (metal halides: rock salt, ammonium chloride, fluorspar, etc.) 2.2.3.3.3.3.1.3. [Metal semi-metal compounds] (iron arsenite, calaverite etc.) One level further to [Sulphides] (metal sulphur: pyrite, cinnabar, galena, etc.) One level further to [Halides] (metal halides: rock salt, ammonium chloride, fluorspar, etc.) One level further to [Metal semi-metal compounds] (iron arsenite, calaverite etc.)

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[Metal with non-metals or semi-metals]