A Summary of Progress in Petrography. in 1887-1896 |
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Page 1885
... original constituent . The crys- tallized variety is thought to have arisen from the solution of a portion of the inclusions and a subsequent re - separation of cordierite , as well- developed crystals . The author regards the same ...
... original constituent . The crys- tallized variety is thought to have arisen from the solution of a portion of the inclusions and a subsequent re - separation of cordierite , as well- developed crystals . The author regards the same ...
Page 1886
... original . In every case it is found that there is a tendency of the rock to possess as constituents one or more rare rock - forming minerals . As the writer has examined all these very carefully , his paper is a mine of wealth to the ...
... original . In every case it is found that there is a tendency of the rock to possess as constituents one or more rare rock - forming minerals . As the writer has examined all these very carefully , his paper is a mine of wealth to the ...
Page 1887
... original color . Its composition is : 9.44 7.14 SiO , NiO ZnO FeO CaO MgO As2O , H2O at 100 ° H2O at 600 ° 31.62 38.22 4.00 2.03 .70 .42 4.77 corresponding to NiZnFe ( SiO3 ) + 11⁄2 Aq . It is therefore a nickel- iferous garnierite ...
... original color . Its composition is : 9.44 7.14 SiO , NiO ZnO FeO CaO MgO As2O , H2O at 100 ° H2O at 600 ° 31.62 38.22 4.00 2.03 .70 .42 4.77 corresponding to NiZnFe ( SiO3 ) + 11⁄2 Aq . It is therefore a nickel- iferous garnierite ...
Page 1893
... original constituent . The crys- tallized variety is thought to have arisen from the solution of a portion of the inclusions and a subsequent re - separation of cordierite , as well- developed crystals . The author regards the same ...
... original constituent . The crys- tallized variety is thought to have arisen from the solution of a portion of the inclusions and a subsequent re - separation of cordierite , as well- developed crystals . The author regards the same ...
Page 1894
... original . In every case it is found that there is a tendency of the rock to possess as constituents one or more rare rock - forming minerals . As the writer has examined all these very carefully , his paper is a mine of wealth to the ...
... original . In every case it is found that there is a tendency of the rock to possess as constituents one or more rare rock - forming minerals . As the writer has examined all these very carefully , his paper is a mine of wealth to the ...
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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
Popular passages
Page 5 - The olivine is surrounded by a reactionary rim consisting of an inner zone of hypersthene and an outer one of actinolite.