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Books Bücher 1 - 1 von 1 in Under the microscope the greater part of the rock is seen to be composed of spherulites...
" Under the microscope the greater part of the rock is seen to be composed of spherulites of distinctly recognizable fibers and shreds that radiate in branching. "
The Geology and Petrography of Crater Lake National Park - Seite 118
von Joseph Silas Diller, Horace Bushnell Patton - 1902 - 167 Seiten
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U.S. Geological Survey Professional Paper

1902
...porous light-gray rock of lithoidal character, mixed to a certain extent locally with dark grayish-green glassy portions. Both the lithoidal and glassy portions...extinguish both parallel and oblique. Whether they arc actually intergrown with quartz can not positively be asserted. The outer portion of the spherulite...
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