A Summary of Progress in Petrography. in 1887-1896 |
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Page 1885
... Fe , O , FeO MnO MgO 9.17 tr 6.03 Sp . Gr . 2.625-2.628 48.58 32.44 3.15 The mineral is usually fresh , but contains numerous inclusions of silli- manite , whose composition is : Al , O , = 63.52 % , SiO2 = 35.43 % . The granular ...
... Fe , O , FeO MnO MgO 9.17 tr 6.03 Sp . Gr . 2.625-2.628 48.58 32.44 3.15 The mineral is usually fresh , but contains numerous inclusions of silli- manite , whose composition is : Al , O , = 63.52 % , SiO2 = 35.43 % . The granular ...
Page 1887
... MnO 10.04 , Fe , O , = 1.80 , CaO tr . It is a manganese willemite with the formula ( ZnMnFe ) , SiO . — De ... 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 ...
... MnO 10.04 , Fe , O , = 1.80 , CaO tr . It is a manganese willemite with the formula ( ZnMnFe ) , SiO . — De ... 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 ...
Page 1888
... MnO FeO CaO 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 ... 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 ...
... MnO FeO CaO 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 ... 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 ...
Page 1889
... Fe , O , MnO CaO MgO HO 20.2 1.5 35.8 .4 -Fouquéite . — In his excellent paper on scapolite rocks , Lacroix 15 describes a dimorphous form of zoisite occurring as a constituent in an anorthite gneiss from the District of Salem , Madras ...
... Fe , O , MnO CaO MgO HO 20.2 1.5 35.8 .4 -Fouquéite . — In his excellent paper on scapolite rocks , Lacroix 15 describes a dimorphous form of zoisite occurring as a constituent in an anorthite gneiss from the District of Salem , Madras ...
Page 1893
... Fe , O , FeO MnO MgO 48.58 32.44 3.15 9.17 tr 6.03 Sp . Gr . 2.625-2.628 = The mineral is usually fresh , but contains numerous inclusions of silli- manite , whose composition is : Al , O , 63.52 % , SiO , 35.43 % . The granular ...
... Fe , O , FeO MnO MgO 48.58 32.44 3.15 9.17 tr 6.03 Sp . Gr . 2.625-2.628 = The mineral is usually fresh , but contains numerous inclusions of silli- manite , whose composition is : Al , O , 63.52 % , SiO , 35.43 % . The granular ...
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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.