A Summary of Progress in Petrography. in 1887-1896 |
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Page 1885
... of quartz , of aggregates of quartz and cordierite , and of a biotite gneiss rich in cordierite and garnet . A portion of the cordierite , separated from the rock , was analyzed with this result : SiO2 Al , O , Fe , O , FeO MnO MgO 9.17 ...
... of quartz , of aggregates of quartz and cordierite , and of a biotite gneiss rich in cordierite and garnet . A portion of the cordierite , separated from the rock , was analyzed with this result : SiO2 Al , O , Fe , O , FeO MnO MgO 9.17 ...
Page 1888
... Al , O , Ce , O , Y2O , ( LaDi ) , 0 , 29.17.854 12.00 .77 2.89 .60 -55 1.86 46.50 2.94 UO , Ign . .83 .79 . · Thorogummite usually occurs in small pieces intimately associated with fergusonite and cyrtolite . It has a dull yellowish ...
... Al , O , Ce , O , Y2O , ( LaDi ) , 0 , 29.17.854 12.00 .77 2.89 .60 -55 1.86 46.50 2.94 UO , Ign . .83 .79 . · Thorogummite usually occurs in small pieces intimately associated with fergusonite and cyrtolite . It has a dull yellowish ...
Page 1889
... of 3.24-3.31 . It occurs in two varieties , the compositions of which are as follows : SiO , Al , O , FeO CaO Loss . Colorless : 36.6 32.5 1.9 23.9 2.7 Yellow : 38.3 31.9 4.4 23.5 2.7 -Pleonektite occurs with arseniopleite in the gangue of ...
... of 3.24-3.31 . It occurs in two varieties , the compositions of which are as follows : SiO , Al , O , FeO CaO Loss . Colorless : 36.6 32.5 1.9 23.9 2.7 Yellow : 38.3 31.9 4.4 23.5 2.7 -Pleonektite occurs with arseniopleite in the gangue of ...
Page 1893
... of quartz , of aggregates of quartz and cordierite , and of a biotite gneiss rich in cordierite and garnet . A portion of the cordierite , separated from the rock , was analyzed with this result : SiO2 Al , O Fe , O , FeO MnO MgO 48.58 ...
... of quartz , of aggregates of quartz and cordierite , and of a biotite gneiss rich in cordierite and garnet . A portion of the cordierite , separated from the rock , was analyzed with this result : SiO2 Al , O Fe , O , FeO MnO MgO 48.58 ...
Page 1897
... of 3.24-3.31 . It occurs in two varieties , the compositions of which are as follows : Sio , ALO , FeO CaO Loss . Colorless : 36.6 32.5 1.9 23.9 2.7 Yellow : 38.3 31.9 4.4 23.5 2.7 -Pleonektite occurs with arseniopleite in the gangue of ...
... of 3.24-3.31 . It occurs in two varieties , the compositions of which are as follows : Sio , ALO , FeO CaO Loss . Colorless : 36.6 32.5 1.9 23.9 2.7 Yellow : 38.3 31.9 4.4 23.5 2.7 -Pleonektite occurs with arseniopleite in the gangue of ...
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Common terms and phrases
acute bisectrix Al,O Amer AMERICAN NATURALIST amphibole analysis andesites apatite augite axial ratio basalt biotite bisectrix brown Bull calcite Colby University color colorless composition containing cordierite corresponding described diabase diorites double refraction dykes Edited by Dr epidote eruptive Fe,O feldspar FeO CaO MgO FeO MnO Förh formula gabbro garnet Geol gneiss grains granite green ground-mass H₂O hardness hexagonal hornblende inclusions isomorphous Jour Kryst Lacroix lamellæ lithophysæ lustre magma magnetite MAKERS SYRACUSE manganese mica microlites mineral occurs MINERALOGY AND PETROGRAPHY.¹ molecule monoclinic Na,O Na₂O nepheline Neues Jahrb olivine optical angle optical axes original orthoclase orthorhombic Petrog PETROGRAPHY.¹ Petrographical phenocrysts plagioclase pleochroic porphyritic porphyritic crystals pressure prismatic produced pyroxene quartz regarded resembles rhombohedral rocks scapolite schists silica small crystals specific gravity spherulites structure substance symmetry thin section tion twinning plane variety W. S. Bayley Waterville yellow yielded Zeits
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Page 5 - The olivine is surrounded by a reactionary rim consisting of an inner zone of hypersthene and an outer one of actinolite.