A treatise on chemistry. Vol. II, Metals. Part II / by H.E. Roscoe & C. Schorlemmer ...

  • Henry Enfield Roscoe
Date:
1880
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Licence: Public Domain Mark

Credit: A treatise on chemistry. Vol. II, Metals. Part II / by H.E. Roscoe & C. Schorlemmer ... Source: Wellcome Collection.

Provider: This material has been provided by University of Bristol Library. The original may be consulted at University of Bristol Library.

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    VOLUME II.—PART IL METALS OF TPIE IRON GROUP. Manganese. Iron. Cobalt. Nickel. 312 The monoxides of these metals are basic oxides, whose sulphates form double salts with the sulphates of the alkali metals, and these are isomorphous with the double sulphates of the magnesium group. The metals of this group are also con- nected with those of the foregoing group, inasmuch as manga- nese and iron form sesquioxides, which act as feebly basic oxides, whilst their sulphates form alums with the sulphates of the alkali metals. The sesquioxides of nickel and cobalt, on the other hand, act as peroxides. In addition to these, certain acid- forming oxides, or their corresponding acids, are also formed by the metals of this group. 313 Black oxide of manganese, manganese dioxide, or pyro- lusite, was known in early times, but for a long period this compound was confounded with magnetic iron ore, and this fact explains the statement of Pliny that loadstone was em- ployed in the manufacture of glass for the purpose of removing or attracting the impurities or colouring matters out of the glass. He distinguished moreover several kinds of magnes ; one of these, which is of the feminine gender, does not attract iron: magnes qui niger est et feminei sexus, ideoque sine MANGANESE, Mn. = 548.
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