A Summary of Progress in Petrography. in 1887-1896 |
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Page 1885
... grains associated with 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 ...
... grains associated with 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 ...
Page 1893
... grains associated with 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 ...
... grains associated with 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 ...
Page 1898
... grains of a mineral that occurs scattered throughout the ore as well as through- out all the minerals associated with the ore , and in veins cutting the surrounding limestone . The largest masses of the mineral are in a magnese ...
... grains of a mineral that occurs scattered throughout the ore as well as through- out all the minerals associated with the ore , and in veins cutting the surrounding limestone . The largest masses of the mineral are in a magnese ...
Page 1
... grains of sand or small shells . The original carbonate has for the most part disappeared , leaving the magnetite as ... grain it loses feldspar , and assumes muscovite , until finally it approaches in structure and composition the ...
... grains of sand or small shells . The original carbonate has for the most part disappeared , leaving the magnetite as ... grain it loses feldspar , and assumes muscovite , until finally it approaches in structure and composition the ...
Page 2
... grains of epidote , a rutile quartz and calcite . The glaucophane is present in elongated prisms , which form a felt around epidote , and are included in the quartz . Mineralogical News . - Morphological and Physical Properties.— The ...
... grains of epidote , a rutile quartz and calcite . The glaucophane is present in elongated prisms , which form a felt around epidote , and are included in the quartz . Mineralogical News . - Morphological and Physical Properties.— 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.