A Summary of Progress in Petrography. in 1887-1896 |
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Page 1885
... orthorhombic pyroxene , in which are porphyritic crystals of labradorite , a large quantity of biotite , columnar crystals of bronzite , hornblende , augite , and cordierite . The last - named mineral occurs in the form of irregular ...
... orthorhombic pyroxene , in which are porphyritic crystals of labradorite , a large quantity of biotite , columnar crystals of bronzite , hornblende , augite , and cordierite . The last - named mineral occurs in the form of irregular ...
Page 1888
... orthorhombic mineral , with an axial ratio 1.2594 : 1 : .6018 , and the plane of its optical axes parallel to ∞ Poo . From the few chemical tests made upon the small amount of material at his command , Fletcher supposes the mineral to ...
... orthorhombic mineral , with an axial ratio 1.2594 : 1 : .6018 , and the plane of its optical axes parallel to ∞ Poo . From the few chemical tests made upon the small amount of material at his command , Fletcher supposes the mineral to ...
Page 1889
... orthorhombic crystals , with a hardness of 4.5 , and Sp . Gr = 3.87 . Its composition is : 29. I 2.5 1.7 9.9 The As2O , Sb , O , Mn , O , Fe , O , MnO CaO MgO HO 20.2 1.5 35.8 .4 -Fouquéite . — In his excellent paper on scapolite rocks ...
... orthorhombic crystals , with a hardness of 4.5 , and Sp . Gr = 3.87 . Its composition is : 29. I 2.5 1.7 9.9 The As2O , Sb , O , Mn , O , Fe , O , MnO CaO MgO HO 20.2 1.5 35.8 .4 -Fouquéite . — In his excellent paper on scapolite rocks ...
Page 1893
... orthorhombic pyroxene , in which are porphyritic crystals of labradorite , a large quantity of biotite , columnar crystals of bronzite , hornblende , augite , and cordierite . The last - named mineral occurs in the form of irregular ...
... orthorhombic pyroxene , in which are porphyritic crystals of labradorite , a large quantity of biotite , columnar crystals of bronzite , hornblende , augite , and cordierite . The last - named mineral occurs in the form of irregular ...
Page 1896
... orthorhombic mineral , with an axial ratio 1.2594 : 1 : .6018 , and the plane of its optical axes parallel to P. From the few chemical tests made upon the small amount of material at his command , Fletcher supposes the mineral to be an ...
... orthorhombic mineral , with an axial ratio 1.2594 : 1 : .6018 , and the plane of its optical axes parallel to P. From the few chemical tests made upon the small amount of material at his command , Fletcher supposes the mineral to be an ...
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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.