. The Edinburgh new philosophical journal. Science. M. Hartwalfs Examination of some Minerals. 39 composition, the latter having its composition represented by the following formula :— % Manganesian Epidote or Pistacite. The mineral found at St Marcet in Piedmont, and known to mineralogists under the name Manganesian Epidote, was refer- red to the epidote genus, on account of its scries of crystalliza- tions. This mineralogical determination it was desirous to have confirmed by chemical analysis; and, further, chemists were cu- rious to know the particular state of oxidation of the manga- nese
. The Edinburgh new philosophical journal. Science. M. Hartwalfs Examination of some Minerals. 39 composition, the latter having its composition represented by the following formula :— % Manganesian Epidote or Pistacite. The mineral found at St Marcet in Piedmont, and known to mineralogists under the name Manganesian Epidote, was refer- red to the epidote genus, on account of its scries of crystalliza- tions. This mineralogical determination it was desirous to have confirmed by chemical analysis; and, further, chemists were cu- rious to know the particular state of oxidation of the manga- nese and iron which it contains. The following is the analysis of Hart wall:— Per Cent. Quantity of Oxygen. Silica, ... Alumina, . - 0 2030 17-65 Lime, .... Peroxide of Manganese, Peroxide of Iron, Magnesia, I have inferred, says Hartwall, by the calculation of the result of the analysis, that the manganese and iron occur in the mineral in the state of peroxide. This is proved not only by the dimi- nished quantity of the isomorphous alumina along with them, but also by the reddish-brown colour of the mineral. Accord- ing to these data, the formula is as follows :— 1 Si. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Edinburgh : A. and C. Black [etc. ]
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