Bulletin of the Geological Society of America Volume 6.cGeological Society of America
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Author: Geological Society of America
Number of Pages: 234 pages
Published Date: 01 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781130289763
File size: 45 Mb
File Name: Bulletin.of.the.Geological.Society.of.America.Volume.6.pdf
Download Link: Bulletin of the Geological Society of America Volume 6
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1895 Excerpt: ...255 shreds, the former reaching a centimeter across, and with it are many green augites of much the same size and character. Plagioclase is seldom lacking, and irregular bits of magnetite, shreds of biotite, titanite and apatite appear in decreasing order of abundance. Red garnets, often of large size, are very common, and masses of this mineral from an inch to several inches across attract the observer's attention. They have the usual abundance of inclusions. In several localities, especially in Ticonderoga, scapolite has been found to take the place of feldspar, thus affording the same rock which has been observed by C. H. Smyth, Jr., on the west side at the base of the limestone series. The graphitic Mica-schists.--At two widely separated points graphitic mica-schist has also been noted. It is a thinly schistose, tender rock, with a peculiar yellow, rusty outcrop, which belies its mineralogy, for there is little of ferruginous minerals in it. It occurs abundantly on the lake-shore just south of Cheever dock and in the interior of Moriah, south of the Pilfershire mine. Under the microscope the rock is seen to consist chiefly of quartz of all sizes, the largest being 1.5 millimeters in diameter. Plagioclase follows next, but is much less in amount and is frequently microperthitic. Biotite and graphite also appear in irregular shreds. Some microaections show great richness in sillimanite, which forms mats and felts and isolated needles. Dr F. D. Adams, with whom the writer visited the above localities, states that these schists are common associates of the crystalline limestones in Canada. The Gneiss.--Assuming that the Cheever mine is in the limestone series, as it appears to be, interesting data are available near the workings. The ore, however, and its c...
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