On the chemical composition of staurolite and the regular arrangement of its carbonaceous inclusions

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1894
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Abstract
Histol'ical.-In the early analyses of staurolite, especially those of Jacobson* and Rammelsberg,t a great variation was found in the chemical composition, especially in the amounts of sHica, which varied all the way from 27 to 50 per cent.The iron oxide, moreover, was regarded by some investigators as ferric, by others as ferrous, while still others considered that it existed in both states of oxidation.In 1865 Lechartier:j: observed that pulverized staurolite from Brittany and Bolivia, when examined with the microscope, showed both brown and colorless grains.On treatment with hydrofluoric acid, it was found that the colorless ones dissolved, while the staurolite was very slightly attacked.Furthermore, material purified by this treatment was found to be nearly uniform in specific gravity and gave amounts of SiO.varying from 28-29 per cent, agreeing with the purest staurolite from St. Gothard.He also proved that water was an essential constituent of the mineral.In 1872, von Lasaulx § showed, from a microscopic examination of staurolite from various localities, that all crystals are more or less impure from mechanical admixtures, especially of *
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openalex_W2329485412 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors S. L. Penfield, Joseph H. Pratt
Journal american journal of science
Year 1894
DOI
10.2475/ajs.s3-47.278.81
URL
https://doi.org/10.2475/ajs.s3-47.278.81
Keywords Keywords not found

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