The use of the blowpipe in chemical analysis, and in the examination of minerals / by J.J. Berzelius ; translated from the French of M. Fresnel, by J. G. Children. With a sketch of Berzelius' system of mineralogy; a synoptic table of the principal characters of the pure earths and metallic oxides before the blowpipe, and numerous notes and additions by the translator.

  • Berzelius, Jöns Jakob, friherre, 1779-1848.
Date:
1822
Catalogue details

Licence: Public Domain Mark

Credit: The use of the blowpipe in chemical analysis, and in the examination of minerals / by J.J. Berzelius ; translated from the French of M. Fresnel, by J. G. Children. With a sketch of Berzelius' system of mineralogy; a synoptic table of the principal characters of the pure earths and metallic oxides before the blowpipe, and numerous notes and additions by the translator. Source: Wellcome Collection.

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    In the forceps it fuses with exceeding slight effervescence into a black shining glass. With borax fuses easily into a glass strongly coloured by iron. With salt of phosphorus decomposes slowly, and gives a silica skeleton, in which the unde- composed nucleus is distinguished by its black colour. The ferruginous colour of the glass dis- appears on cooling. With soda fuses readily into a black glass, whose surface becomes dull by a fresh quantity of soda* This mineral absorbs a much larger portion of the flux than any of the preceding before it is convert- ed into a scoria. (,3.) Dark green pyroxene, from Taberg, near Phiiipstad, and from Arendal ; dark red malaco- lite, from Degerö in Finland ; all behave like the preceding mineral. (d.) Aluminous pyroxenes, the greater part of which are black. (a.) Pyroxene, from Pargas.1 (,3.) Pyroxene, from Auvergne, from Lava. They behave like pyroxenes in general, but are much more difficult to decompose by salt of phos- phorus, and even almost indecomposable by that flux. The assay changes from its original black, and becomes translucid, and almost colourless. 1 One compound atom, formed of an atom of silicate of protoxide of iron -f 2 of silicate of alumina, combined with three compound atoms, each formed of 1 atom of bisilicate