The American Geologist, Volume 26Newton Horace Winchell Geological Publishing Company, 1900 - Geology Includes section "Review of recent geological literature." |
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Page 164
... plagioclase and pyroxene in approximately equal amounts , with more or less magnetite and a few small crystals of apatite . But if strictly normal gabbro is rare , the same is not true of normal olivine gabbro , which is the domin- ant ...
... plagioclase and pyroxene in approximately equal amounts , with more or less magnetite and a few small crystals of apatite . But if strictly normal gabbro is rare , the same is not true of normal olivine gabbro , which is the domin- ant ...
Page 165
... plagioclase anhedra are usually larger and perfectly fresh and glassy . The augite is jet black in mass , but thin splinters are greenish - black . It usually crystallizes without any definite form , but is occasion- ally triangular or ...
... plagioclase anhedra are usually larger and perfectly fresh and glassy . The augite is jet black in mass , but thin splinters are greenish - black . It usually crystallizes without any definite form , but is occasion- ally triangular or ...
Page 166
... plagioclase anhedra , but also occurs included within them . It is practically never absent , but is seldom abundant . There is very little doubt that the fine acicular inclusions in the feld- spar , as well as dust - like particles ...
... plagioclase anhedra , but also occurs included within them . It is practically never absent , but is seldom abundant . There is very little doubt that the fine acicular inclusions in the feld- spar , as well as dust - like particles ...
Page 167
... plagioclase , it was still uncompleted when the latter mineral had solidified in large measure . The plagioclase , while in general the last of the original minerals to solidify , began to crystallize some time before the ...
... plagioclase , it was still uncompleted when the latter mineral had solidified in large measure . The plagioclase , while in general the last of the original minerals to solidify , began to crystallize some time before the ...
Page 173
... plagioclase , on ac- count of intervening rims of augite . The pyroxene very often shows the inclusions so well known in bronzite , and probably identical in nature with those occurring in diallage and also in labradorite . They are ...
... plagioclase , on ac- count of intervening rims of augite . The pyroxene very often shows the inclusions so well known in bronzite , and probably identical in nature with those occurring in diallage and also in labradorite . They are ...
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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
Popular passages
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Page 5 - History, an incalculable stimulus would be given to science in Canada, by promoting research, by securing to this country the credit of the work done in it, by collecting the information now widely scattered, and by enabling scientific men abroad to learn what is being done here.