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Marble

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MICA.
147
it is freely soluble in acetic acid ; in the second place, receives a mark from steel ; and, finally, it is reduced to lime by fire while giving out a great quantity of carbonic acid.
Marble is partly composed of a sort of metal of ferruginous appearance, combined with carbon and oxygen. The proportions of its component parts vary according to the different qualities ; however, in general, it is equal to three-tenths of metal, one-tenth of carbon, and the remainder of fixed oxygen.
The specific gravity of this substance varies from 2-650 to 2-850.
The purest marble is always white, and the various colourations which form its different qualities are due to extraneous substances, either stony or metallic, the different arrangements of which modify it by the colour of its different tints.
Marble of all kinds is amongst the productions which are most generally used in art and manufactures. But to give their history and classification would be beyond our proposed limits.
LXIII.
MICA.
For a long time, this name has distinguished certain substances capable of being divided into layers, which are elastic, very thin, translucent and fusible, of which the surface always remains bright, whence its name from
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