A Summary of Progress in Petrography. in 1887-1896 |
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Page 1887
... nepheline cementing porphyritic crystals of olivine , shreds of biotite , microlites of augite and magnetite , is announced by Levy and Callot as existing in a boss near Rougiers in Var , France . New Minerals . - Tephrowillemite . - Dr ...
... nepheline cementing porphyritic crystals of olivine , shreds of biotite , microlites of augite and magnetite , is announced by Levy and Callot as existing in a boss near Rougiers in Var , France . New Minerals . - Tephrowillemite . - Dr ...
Page 1895
... nepheline cementing porphyritic crystals of olivine , shreds of biotite , microlites of augite and magnetite , is announced by Levy and Callot as existing in a boss near Rougiers in Var , France . 7 New Minerals . - Tephrowillemite ...
... nepheline cementing porphyritic crystals of olivine , shreds of biotite , microlites of augite and magnetite , is announced by Levy and Callot as existing in a boss near Rougiers in Var , France . 7 New Minerals . - Tephrowillemite ...
Page
... nepheline syenite region of Southern Norway has at last made its appearance . The special part of the volume , which describes in great detail seventy mineral species , is prefixed by an introduction of 235 pages , in which the geology ...
... nepheline syenite region of Southern Norway has at last made its appearance . The special part of the volume , which describes in great detail seventy mineral species , is prefixed by an introduction of 235 pages , in which the geology ...
Page
... nepheline . Another rock very characteristic of the region is called laurdalite . This is a coarse - grained nepheline - syenite , with or without olivine . It contains . more nepheline and sodalite than does laurvikite , and the former ...
... nepheline . Another rock very characteristic of the region is called laurdalite . This is a coarse - grained nepheline - syenite , with or without olivine . It contains . more nepheline and sodalite than does laurvikite , and the former ...
Page
... nepheline - porphyry . Hedrumite is trachytic , but it contains no elæolite , or , if any , but a small quantity . A tinguaite variety of these rocks is also recognized . Among the acid rocks a quartz - bearing augite - syenite is ...
... nepheline - porphyry . Hedrumite is trachytic , but it contains no elæolite , or , if any , but a small quantity . A tinguaite variety of these rocks is also recognized . Among the acid rocks a quartz - bearing augite - syenite is ...
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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.