A Summary of Progress in Petrography. in 1887-1896 |
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Page 1885
... composition is : Al , O , = 63.52 % , SiO2 = 35.43 % . The granular cordierite is supposed to represent the remains of foreign inclusions in which the mineral was an original constituent . The crys- tallized variety is thought to have ...
... composition is : Al , O , = 63.52 % , SiO2 = 35.43 % . The granular cordierite is supposed to represent the remains of foreign inclusions in which the mineral was an original constituent . The crys- tallized variety is thought to have ...
Page 1887
... 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 . - Yttrialite . - From ...
... 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 . - Yttrialite . - From ...
Page 1888
... Composition : SiO , UO , ThO , AO , Fe , О ̧ ( CeY ) , O , PbO CaO H2O PO Ign 13.085 22.43 41.44 .965 .845 6.69 2.16 .41 7.88 1.19 1.23 corresponding to UO ( ThOSi ) ,, ( OH ) 12 , or gummite in which the water has been replaced by ...
... Composition : SiO , UO , ThO , AO , Fe , О ̧ ( CeY ) , O , PbO CaO H2O PO Ign 13.085 22.43 41.44 .965 .845 6.69 2.16 .41 7.88 1.19 1.23 corresponding to UO ( ThOSi ) ,, ( OH ) 12 , or gummite in which the water has been replaced by ...
Page 1889
... composition is ЗРЬО Н.О. The second mineral ( from Wanlockhead ) resembles hydroplumbite in appearance , but yields upon analysis a result corres- ponding to the formula PbCO , + 3 PbO H2O [ PbO = 92.85 , CO , = 4.76 , H , O = 2.01 ...
... composition is ЗРЬО Н.О. The second mineral ( from Wanlockhead ) resembles hydroplumbite in appearance , but yields upon analysis a result corres- ponding to the formula PbCO , + 3 PbO H2O [ PbO = 92.85 , CO , = 4.76 , H , O = 2.01 ...
Page 1893
... composition is : Al , O , 63.52 % , SiO , 35.43 % . The granular cordierite is supposed to represent the remains of foreign inclusions in which the mineral was an original constituent . The crys- tallized variety is thought to have ...
... composition is : Al , O , 63.52 % , SiO , 35.43 % . The granular cordierite is supposed to represent the remains of foreign inclusions in which the mineral was an original constituent . The crys- tallized variety is thought to have ...
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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.