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abundant acicular acid alteration angle of extinction Annual Report apatite appears atlas biotite black grains border Bulletins carbonate Carboniferous chemical analysis chiefly cleavage coal field colored colorless mica composed composition contains crossed nicols crystallization Deposits dichroic dike distinctly distributed dolomite dotite doubly refracting dunite Elliott County enstatite eruptive mass Faunas feldspar feldspathic rocks fibers fibrous fissures Fossil fragments of shale frequently garnet Geological Survey hand specimen Henry Gannett hornblende ilmenite included fragments irregular isotropic Kentucky magnetite metamorphism mica microscope millimeters in diameter mineral mineralogical O. C. Marsh observed occurs octahedrite olivine oxide parallel peridotite PERIDOTITE OF ELLIOTT peridotite seen picotite plagioclase pleochroism portion present Price 15 Price 5 cents Professor Crandall prominent pyrope pyroxene quartz represented in Fig S. F. Emmons sandstone scales sections sedimentary serpentine Silurian Silurian axis specific gravity strong double refraction structure T. M. Chatard United States Geological variolitic yellowish Zweite
GEOL. CURATOR - Cover 8(1)
Peridotite of Elliott County, Kentucky, United States Geological Survey Bulletin, 1887, 38: 9–31. ———, Geology of the Lassen Peak District, United States ...
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