A Summary of Progress in Petrography. in 1887-1896 |
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Page 1885
... quartz , and also in well - developed crystals , with a pleochroism : A = yellowish - white ; B = dark violet ; C = light violet . In the rock are inclusions of quartz , of aggregates of quartz and cordierite , and of a biotite gneiss ...
... quartz , and also in well - developed crystals , with a pleochroism : A = yellowish - white ; B = dark violet ; C = light violet . In the rock are inclusions of quartz , of aggregates of quartz and cordierite , and of a biotite gneiss ...
Page 1886
... 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 - stone and esmarkite are referred to , the properties ...
... 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 - stone and esmarkite are referred to , the properties ...
Page 1888
William Shirley Bayley. yttria and thoria minerals associated with less rare compounds in the quartz veins cutting granite . Among the bodies new to mineral- ogy was found a yellowish substance in large masses with an olive- green color ...
William Shirley Bayley. yttria and thoria minerals associated with less rare compounds in the quartz veins cutting granite . Among the bodies new to mineral- ogy was found a yellowish substance in large masses with an olive- green color ...
Page 1893
... quartz , and also in well - developed crystals , with a pleochroism : A = yellowish - white ; B = dark violet ; C = light violet . In the rock are inclusions of quartz , of aggregates of quartz and cordierite , and of a biotite gneiss ...
... quartz , and also in well - developed crystals , with a pleochroism : A = yellowish - white ; B = dark violet ; C = light violet . In the rock are inclusions of quartz , of aggregates of quartz and cordierite , and of a biotite gneiss ...
Page 1894
... 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 - stone and esmarkite are referred to , the properties ...
... 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 - stone and esmarkite are referred to , the properties ...
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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.