A Summary of Progress in Petrography. in 1887-1896 |
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Page 1885
... garnet . A portion of the cordierite , separated from the rock , was analyzed with this result : SiO2 Al , O , Fe , O , FeO MnO MgO 9.17 tr 6.03 Sp . Gr . 2.625-2.628 48.58 32.44 3.15 The mineral is usually fresh , but contains numerous ...
... garnet . A portion of the cordierite , separated from the rock , was analyzed with this result : SiO2 Al , O , Fe , O , FeO MnO MgO 9.17 tr 6.03 Sp . Gr . 2.625-2.628 48.58 32.44 3.15 The mineral is usually fresh , but contains numerous ...
Page 1886
... garnet and micropegmatitic intergrowths of pyroxene and quartz ( page 297 ) , pyrox- ene and oligoclase ( pp . 316-318 ) , garnet and quartz ( p . 317 ) , and amphibole and oligoclase ( p . 319 ) . The varieties of feldspar known as sun ...
... garnet and micropegmatitic intergrowths of pyroxene and quartz ( page 297 ) , pyrox- ene and oligoclase ( pp . 316-318 ) , garnet and quartz ( p . 317 ) , and amphibole and oligoclase ( p . 319 ) . The varieties of feldspar known as sun ...
Page 1887
... garnet , at a depth of 340 feet from the surface , is a greenish substance encrusting fluorite and filling cavities in it . In the closed tube it yields water and turns brown . It is infusible before the blow- pipe , but at this high ...
... garnet , at a depth of 340 feet from the surface , is a greenish substance encrusting fluorite and filling cavities in it . In the closed tube it yields water and turns brown . It is infusible before the blow- pipe , but at this high ...
Page 1893
... garnet . A portion of the cordierite , separated from the rock , was analyzed with this result : SiO2 Al , O Fe , O , FeO MnO MgO 48.58 32.44 3.15 9.17 tr 6.03 Sp . Gr . 2.625-2.628 = The mineral is usually fresh , but contains numerous ...
... garnet . A portion of the cordierite , separated from the rock , was analyzed with this result : SiO2 Al , O Fe , O , FeO MnO MgO 48.58 32.44 3.15 9.17 tr 6.03 Sp . Gr . 2.625-2.628 = The mineral is usually fresh , but contains numerous ...
Page 1894
... garnet and micropegmatitic intergrowths of pyroxene and quartz ( page 297 ) , pyrox- ene and oligoclase ( pp . 316-318 ) , garnet and quartz ( p . 317 ) , and amphibole and oligoclase ( p . 319 ) . The varieties of feldspar known as sun ...
... garnet and micropegmatitic intergrowths of pyroxene and quartz ( page 297 ) , pyrox- ene and oligoclase ( pp . 316-318 ) , garnet and quartz ( p . 317 ) , and amphibole and oligoclase ( p . 319 ) . The varieties of feldspar known as sun ...
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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.