A Summary of Progress in Petrography. in 1887-1896 |
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Results 1-5 of 14
Page 1886
... mica - schist from Salem , India ; and the new mineral fouquéite in a gneiss from the same vicinity . Original epidote and parallel growths of this mineral with allanite in a pyroxene gneiss from Morbihan , France , and in a scapolite ...
... mica - schist from Salem , India ; and the new mineral fouquéite in a gneiss from the same vicinity . Original epidote and parallel growths of this mineral with allanite in a pyroxene gneiss from Morbihan , France , and in a scapolite ...
Page 1894
... mica - schist from Salem , India ; and the new mineral fouquéite in a gneiss from the same vicinity . Original epidote and parallel growths of this mineral with allanite in a pyroxene gneiss from Morbihan , France , and in a scapolite ...
... mica - schist from Salem , India ; and the new mineral fouquéite in a gneiss from the same vicinity . Original epidote and parallel growths of this mineral with allanite in a pyroxene gneiss from Morbihan , France , and in a scapolite ...
Page 1902
... mica and augite andesites , the latter of which contain porphyritic sanidine and olivine . The younger crater , Lago di Vico , has poured forth leucite bearing rocks , of which leucitophyre , leucite - tephrite , leucite- basanite and ...
... mica and augite andesites , the latter of which contain porphyritic sanidine and olivine . The younger crater , Lago di Vico , has poured forth leucite bearing rocks , of which leucitophyre , leucite - tephrite , leucite- basanite and ...
Page 1
... mica , chiastolite and andalusite were developed . By the subsequent intrusion of gran- 6 Traité de Geognosie , 1819 , p , 117 . 7 Erl . z . Geol . Specialk , des Königr . Sachsen Blatt , 64. , 8 Geol . Mag . , Dec. , 1888 , p . 555 . 9 ...
... mica , chiastolite and andalusite were developed . By the subsequent intrusion of gran- 6 Traité de Geognosie , 1819 , p , 117 . 7 Erl . z . Geol . Specialk , des Königr . Sachsen Blatt , 64. , 8 Geol . Mag . , Dec. , 1888 , p . 555 . 9 ...
Page
... mica . It forms , small , thick rhombohedral crystals , with a : c 1 : 2.1422 . The principal forms present are oR , IR , IR , R , ∞ R ‚ — 2R , — ↓ R and ∞ P2 . The faces are sometimes brilliant , and at others dull . The crystals ...
... mica . It forms , small , thick rhombohedral crystals , with a : c 1 : 2.1422 . The principal forms present are oR , IR , IR , R , ∞ R ‚ — 2R , — ↓ R and ∞ P2 . The faces are sometimes brilliant , and at others dull . The crystals ...
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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.