On the magnetite ore districts of Jacupiranga and Ipanema, Sao Paulo, Brazil

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Abstract
This is in accord with the general character of the ores, that of Ipanema being a pure magnetite, while that of jacupil•anga is highly titaniferous.* The daily increasing importance, wide range of variation and peculiar character of the orthoclase-pyroxene combination seems to demand a simple non-committal term as a generic title for so• called augite-syenite group and Brogger's name Laurvikite is here employed in that sense, * This may be clue to decomposition though as the nepheline is still recognizable it seems singular that orthoclase should have been less persistent_ In the segregations nepheline is totally excluded and primary biotite is rare.
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Authors Orville A. Derby
Journal american journal of science
Year 1891
DOI
10.2475/ajs.s3-41.244.311
URL
https://ajsonline.org/article/64747.pdf
Keywords Keywords not found

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