A Summary of Progress in Petrography. in 1887-1896 |
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Page 1886
... amphibole , and tremo- lite and amphibole , are pictured around olivine in olivine - gabbros , and a rim consisting of biotite and amphibole is figured as seen around ilmenite . In addition to the observations made by Lacroix , there ...
... amphibole , and tremo- lite and amphibole , are pictured around olivine in olivine - gabbros , and a rim consisting of biotite and amphibole is figured as seen around ilmenite . In addition to the observations made by Lacroix , there ...
Page 1894
... amphibole , and tremo- lite and amphibole , are pictured around olivine in olivine - gabbros , and a rim consisting of biotite and amphibole is figured as seen around ilmenite . In addition to the observations made by Lacroix , there ...
... amphibole , and tremo- lite and amphibole , are pictured around olivine in olivine - gabbros , and a rim consisting of biotite and amphibole is figured as seen around ilmenite . In addition to the observations made by Lacroix , there ...
Page 4
... amphibole needles . It is an alteration product of the brown hornblende and the augite , from both of which it ... amphibole is large , and the absorption is A > B > C. A second rock in which the mineral occurs is a conglomerate ...
... amphibole needles . It is an alteration product of the brown hornblende and the augite , from both of which it ... amphibole is large , and the absorption is A > B > C. A second rock in which the mineral occurs is a conglomerate ...
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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.