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Summary
Title: The American journal of science
Identifier: americanjourna3441892newh (find matches)
Year: 1880 (1880s)
Authors:
Subjects: Science
Publisher: New Haven : J. D. & E. S. Dana
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library
Text Appearing Before Image:
Metamorphic Conglomerate in the Green Momitains. 275 seen again in the secondary mineral, while the relationship of maximum pleochroism of these zones to the greatest pleo- chroism of the chlorite is handed down as well. This metaso- matic phenomenon has not been observed in other phases of the ,ottrelite-bearing conglomerate thus far studied by me.
Text Appearing After Image:
Alteration of ottrelite to chlorite. A, overlapping plates of ottrelite. B, bifur- cating vein of chlorite allomorphosed after ottrelite and including cores of unal- tered mineral. C, quartz and feldspar mosaic. The background of the rock is composed about equally of quartz and feldspar as principal constituents. The feldspar is fresh and' glassy, untwinned and is probably albite; but it is hardly abundant enough in the ottrelite-bearing phases to make the rock a gneiss even in mineralogical composition; and, structurally, a gneissic habit has been nowhere observed where ottrelite exists to any extent. Sericite is also abundant and occurs in minute prisms between the interlocking quartz grains and enclosed by the albite generally, and rarely by the ottrelite. It also encloses lines of rutile dots arranged parallel to its cleavage planes, and, next to the ottrelite it is the last- formed mineral. Associated with rutile in the groundmass are groups of stout and slender prisms and plates having a very high single and double refraction and a variable color from brownish-yellow to blue even in the same individual. These T identified as anatase and for verification I studied Diller's sections described in his contribution on " Anatas als Umwandlungsprodukt von Titanit im Biotitamphibolgranit der Troas."* Unlike the anatase *N. J. B., 1, 1883, pp. 187-193.
Nothing Found.