Experimental Chemistry for Junior Students volume 3
Experimental Chemistry for Junior Students volume 3
James Emerson Reynolds
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This is the form of pyrites usually found in coal (and sometimes 2OO Experimental Chemistry. mistaken for gold, owing to its colour), It oxidises in moist air much more rapidly than the ordinary or cubical pyrites, affording ferrous sulphate and sul- phuric acid (see p. 182). The physical distinctions between the two forms of iron disulphide obviously may be due to difference in structure of the chemical molecule, though no such difference has yet been distinctly traced. If either molecule be c...orrectly represented by the formula FeS 2 or S"=Fe iv =S", and not by some multiple of it, the compound is to be regarded as the sulphur representative of the unknown oxide FeO 2 . An iron arsenide is known, termed leucopyrite in allusion to its white colour whose formula is FeAs 2, and an arsenio-sulphide termed mhpickel, 1 or arsen- ical pyrites, occur in comparatively large quantities. These minerals crystallise in the same system as the marcasite variety of iron pyrites, and all three bodies are found to graduate into one another ; hence they are probably also similar in chemical structure.
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