The American Geologist, Volume 26Newton Horace Winchell Geological Publishing Company, 1900 - Geology Includes section "Review of recent geological literature." |
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Page 156
... feldspar are found . The geological literature of this region has become very voluminous within the last twenty years , and the limits of this paper prohibit any extensive bibliographies , which would . moreover , be largely superfluous ...
... feldspar are found . The geological literature of this region has become very voluminous within the last twenty years , and the limits of this paper prohibit any extensive bibliographies , which would . moreover , be largely superfluous ...
Page 165
... feldspar , as well as the much darker cleavages of the pyroxene . The common albite twinning striations are visible nearly always on the feldspar , which is often more abundant than the pyroxene . The plagioclase anhedra are usually ...
... feldspar , as well as the much darker cleavages of the pyroxene . The common albite twinning striations are visible nearly always on the feldspar , which is often more abundant than the pyroxene . The plagioclase anhedra are usually ...
Page 168
... feldspar very near the composition expressed by Abs An ; the other two are of the composition Ab2 An3 . The pyroxenic element of the rock ordinarily belongs to the group of diopside being very poor in alumina ; hypers- thene only occurs ...
... feldspar very near the composition expressed by Abs An ; the other two are of the composition Ab2 An3 . The pyroxenic element of the rock ordinarily belongs to the group of diopside being very poor in alumina ; hypers- thene only occurs ...
Page 172
... Lacroix ; Minéraux des Roches , 1888 , p . 240 . + Michel Lévy : Sur la réfringence des auréoles polychroiques : C. R. CXX . Inclusions . The feldspar of the normal gabbro is nearly 172 September , 1900 The American Geologist .
... Lacroix ; Minéraux des Roches , 1888 , p . 240 . + Michel Lévy : Sur la réfringence des auréoles polychroiques : C. R. CXX . Inclusions . The feldspar of the normal gabbro is nearly 172 September , 1900 The American Geologist .
Page 173
Newton Horace Winchell. Inclusions . The feldspar of the normal gabbro is nearly always in large grains of irregular outline , which often make up a large part of the rock . It is quite fresh and only rarely shows secondary weathering or ...
Newton Horace Winchell. Inclusions . The feldspar of the normal gabbro is nearly always in large grains of irregular outline , which often make up a large part of the rock . It is quite fresh and only rarely shows secondary weathering or ...
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Common terms and phrases
abundant acid albite alteration alumina Amer AMERICAN GEOLOGIST andesine apatite augite biotite Birch lake birefringence bowlingite brown Bull Burlington Canada Carboniferous Carlton peak chemical composition cleavage coal color Cope cordierite cordierite noryte crystals Dawson Devonian diabase dikes elongation extinction angle fayalite feldspar figure flora fossil Fouqué gabbro Geol Geological Survey grains green greenish halos hematite hornblende iron Jour Journ labradorite limestone London magma magnetite mass McGill McGill University mineral mineralogical Minn Minnesota Montreal Natural History nearly normal gabbro Note Nova Scotia occurs olivine olivine diabase olivine gabbro optic angle origin orthoclase orthoclase gabbro oxide parallel penninite perpendicular Peter Redpath Pigeon point plagioclasyte plane plates pleochroism pores Proc Prof pyroxene quartz quartz gabbro rare refringence rock Science shows silicoferrolyte species specimens staurolite structure texture tion troctolyte twinning usually ventral sac Winchell
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