A Summary of Progress in Petrography. in 1887-1896 |
From inside the book
Results 1-5 of 5
Page 1886
... lithophysæ . The article opens with a description of the macroscopic structure of the great mass of obsidian known as Obsidian Cliff , in the Yellowstone National Park . The most striking feature of the southern portion of the mass is ...
... lithophysæ . The article opens with a description of the macroscopic structure of the great mass of obsidian known as Obsidian Cliff , in the Yellowstone National Park . The most striking feature of the southern portion of the mass is ...
Page 1887
... lithophysæ . These con- clusions are in direct opposition to those of Szabo , Roth , Zirkel , and Cole , who regard lithophysæ as resulting from the alteration of spherulites . A nephelinite composed of a granular aggregate of nepheline ...
... lithophysæ . These con- clusions are in direct opposition to those of Szabo , Roth , Zirkel , and Cole , who regard lithophysæ as resulting from the alteration of spherulites . A nephelinite composed of a granular aggregate of nepheline ...
Page 1894
... lithophysæ . The article opens with a description of the macroscopic structure of the great mass of obsidian known as Obsidian Cliff , in the Yellowstone National Park . The most striking feature of the southern portion of the mass is ...
... lithophysæ . The article opens with a description of the macroscopic structure of the great mass of obsidian known as Obsidian Cliff , in the Yellowstone National Park . The most striking feature of the southern portion of the mass is ...
Page 1895
... lithophysæ . These con- clusions are in direct opposition to those of Szabo , Roth , Zirkel , and Cole , who regard lithophysæ as resulting from the alteration of spherulites.A nephelinite composed of a granular aggregate of nepheline ...
... lithophysæ . These con- clusions are in direct opposition to those of Szabo , Roth , Zirkel , and Cole , who regard lithophysæ as resulting from the alteration of spherulites.A nephelinite composed of a granular aggregate of nepheline ...
Page 3
... lithophysæ of the rock from Obsidian Cliff , and contain , like the latter , little honey- yellow crystals of fayalite.In an appendix to an article by Mr. Barlow on the contact of the Huronian and Laurentian rocks north of Lake Huron ...
... lithophysæ of the rock from Obsidian Cliff , and contain , like the latter , little honey- yellow crystals of fayalite.In an appendix to an article by Mr. Barlow on the contact of the Huronian and Laurentian rocks north of Lake Huron ...
Other editions - View all
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.