The Scientific Span Classsearchtermclassspan book Or a Familiar Introd
The Scientific Span Classsearchtermclassspan book Or a Familiar Introd
Walter R Walter Rogers Johnson
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. 1 oxide of iron -f- 1 silica -f- 3 magnesia -j- 2 silica. 13. Hence it appears that the only difference between these Dodies consists in the former containing one atom of lime, (pro- toxide of calcimn, ) and the latter one atom of protoxide of iron ; and they both crystallize in oblique prisms. In numerous other cases it has been found, that one oxide or acid, having the same atomic constitution with another oxide or acid, may replace it, or be substituted for it in the composition of mineral...s, giving rise to similar crystalline forms ; and thus groups are produced, each composed of two or more bodies corresponding in the numbers of their atoms, and in crystalline form. 14. There is an inferior degree of analogy of form observable among minerals, which probably arises, as in the cases already noticed, from the atomic constitution of bodies. Certain crystal- line compounds are found to differ among themselves merely in the angular measurements of their crystals. Thus sulphate of ba- rytes, sulphate of lead, carbonate of lead, and some others, form right rhombic prisms ; but the obtuse angles of the rhombic prism of sulphate of barytes measure 101 42'; those of sulphate of lead 103 42'; and those of carbonate of lead 117 18'.
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