A Summary of Progress in Petrography. in 1887-1896 |
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Page 1885
... Lacroix intends to make a complete study of pyroxene gneiss , and of rocks containing scapolite . He has published the first results of his work in a very excellent paper which is occupied with descriptions of the rocks of these two ...
... Lacroix intends to make a complete study of pyroxene gneiss , and of rocks containing scapolite . He has published the first results of his work in a very excellent paper which is occupied with descriptions of the rocks of these two ...
Page 1886
... Lacroix , there are incorporated in the paper descriptions of the facts discovered by earlier workers in the domain of these rocks . It therefore becomes a valuable compendium of our knowledge of scapolite rocks , so far as known . In ...
... Lacroix , there are incorporated in the paper descriptions of the facts discovered by earlier workers in the domain of these rocks . It therefore becomes a valuable compendium of our knowledge of scapolite rocks , so far as known . In ...
Page 1889
... Lacroix 15 describes a dimorphous form of zoisite occurring as a constituent in an anorthite gneiss from the District of Salem , Madras , India . new mineral is found in corroded and rounded monoclinic crystals , elongated in the ...
... Lacroix 15 describes a dimorphous form of zoisite occurring as a constituent in an anorthite gneiss from the District of Salem , Madras , India . new mineral is found in corroded and rounded monoclinic crystals , elongated in the ...
Page 1893
... Lacroix 3 intends to make a complete study of pyroxene gneiss , and of rocks containing scapolite . He has published the first results of his work in a very excellent paper which is occupied with descriptions of the rocks of these two ...
... Lacroix 3 intends to make a complete study of pyroxene gneiss , and of rocks containing scapolite . He has published the first results of his work in a very excellent paper which is occupied with descriptions of the rocks of these two ...
Page 1894
... Lacroix , there are incorporated in the paper descriptions of the facts discovered by earlier workers in the domain of these rocks . It therefore becomes a valuable compendium of our knowledge of scapolite rocks , so far as known . In ...
... Lacroix , there are incorporated in the paper descriptions of the facts discovered by earlier workers in the domain of these rocks . It therefore becomes a valuable compendium of our knowledge of scapolite rocks , so far as known . In ...
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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.