A Summary of Progress in Petrography. in 1887-1896 |
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Page 1889
... monoclinic crystals , elongated in the direction of their axes , and polysynthetically twined with the orthopinacoid as the composition face of the various lamellæ . They possess a well - marked cleavage parallel to the face as- sumed ...
... monoclinic crystals , elongated in the direction of their axes , and polysynthetically twined with the orthopinacoid as the composition face of the various lamellæ . They possess a well - marked cleavage parallel to the face as- sumed ...
Page 1897
... monoclinic crystals , elongated in the direction of their c axes , and polysynthetically twined with the orthopinacoid as the composition face of the various lamellæ . They possess a well - marked cleavage parallel to the face as- sumed ...
... monoclinic crystals , elongated in the direction of their c axes , and polysynthetically twined with the orthopinacoid as the composition face of the various lamellæ . They possess a well - marked cleavage parallel to the face as- sumed ...
Page 1898
... monoclinic form of barium sulphate , of which barite is the orthorhombic form . It was discovered by Lacroix 18 in the crystallized limestone of Templeton , Canada . It is a flaky , white substance , with three cleavages . These are ...
... monoclinic form of barium sulphate , of which barite is the orthorhombic form . It was discovered by Lacroix 18 in the crystallized limestone of Templeton , Canada . It is a flaky , white substance , with three cleavages . These are ...
Page 2
... monoclinic hemi - pyramid in such a way as to fulfill the conditions of hemihedrism has been shown by Williams . 12 If two of the planes intersecting in the plane of symmetry be allowed to develop to the exclusion of the other two ...
... monoclinic hemi - pyramid in such a way as to fulfill the conditions of hemihedrism has been shown by Williams . 12 If two of the planes intersecting in the plane of symmetry be allowed to develop to the exclusion of the other two ...
Page 3
... monoclinic with a b c 1.735 : 1 : 1.908 . B = 97 ° 59 ′ , and hemi- morphic in the direction of the axis ( really ... mono- clinic form ) , and four to produce forms with three planes of symmetry ( orthorhombic forms ) . The ...
... monoclinic with a b c 1.735 : 1 : 1.908 . B = 97 ° 59 ′ , and hemi- morphic in the direction of the axis ( really ... mono- clinic form ) , and four to produce forms with three planes of symmetry ( orthorhombic forms ) . The ...
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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.