A Summary of Progress in Petrography. in 1887-1896 |
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Page 1888
... green color on a fresh fracture . Its specific gravity is 4.575 , and its hardness 5-5.5 . It is soluble in hydrochloric acid , decrepitates when heated , and breaks into an infusible and insoluble powder . Its com- position is : 2 3 ...
... green color on a fresh fracture . Its specific gravity is 4.575 , and its hardness 5-5.5 . It is soluble in hydrochloric acid , decrepitates when heated , and breaks into an infusible and insoluble powder . Its com- position is : 2 3 ...
Page 1896
... green color on a fresh fracture . Its specific gravity is 4.575 , and its hardness 5-5.5 . It is soluble in hydrochloric acid , decrepitates when heated , and breaks into an infusible and insoluble powder . Its com- position is : 2 Sio ...
... green color on a fresh fracture . Its specific gravity is 4.575 , and its hardness 5-5.5 . It is soluble in hydrochloric acid , decrepitates when heated , and breaks into an infusible and insoluble powder . Its com- position is : 2 Sio ...
Page 1899
... green color on the surface , and a brown color on a fresh fracture . It is found at the Lucky Cuss Mine , Tomb- stone , Arizona . The third came from the Commercial Mine , George- town , New Mexico , where it also is found as an ...
... green color on the surface , and a brown color on a fresh fracture . It is found at the Lucky Cuss Mine , Tomb- stone , Arizona . The third came from the Commercial Mine , George- town , New Mexico , where it also is found as an ...
Page 1901
... green- stones , altered from traps by metasomatic and dynamic metamorphism , and greenstones of clastic origin , hornblende schists and other foliated rocks . The effect of pressure is shown in the broken condition of many of the ...
... green- stones , altered from traps by metasomatic and dynamic metamorphism , and greenstones of clastic origin , hornblende schists and other foliated rocks . The effect of pressure is shown in the broken condition of many of the ...
Page 1902
... green iron silicate . This structure was originally pro- 3 W. Deecke , Neues Jahrb . für Min . , B. B. VI . , 1889 , p . 205 . △ Abh . zur Geol . Specialk . v . Elsass - Lothringen , B. III . , H. III . , p . 137 . 5 Quar . Journ ...
... green iron silicate . This structure was originally pro- 3 W. Deecke , Neues Jahrb . für Min . , B. B. VI . , 1889 , p . 205 . △ Abh . zur Geol . Specialk . v . Elsass - Lothringen , B. III . , H. III . , p . 137 . 5 Quar . Journ ...
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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.