A Summary of Progress in Petrography. in 1887-1896 |
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Page 14
... specific gravity 2.17 . Miner . u . Petrog . Mitth . , XI . , 1890 , p . 214 . 8 • Zeits . f . Kryst . , 1882 , VI . , ) p . 627 . H 9 = They remain unchanged in the air , and [ April , 369 1891. ] Mineralogy and Petrography .
... specific gravity 2.17 . Miner . u . Petrog . Mitth . , XI . , 1890 , p . 214 . 8 • Zeits . f . Kryst . , 1882 , VI . , ) p . 627 . H 9 = They remain unchanged in the air , and [ April , 369 1891. ] Mineralogy and Petrography .
Page 15
... specific gravity = 2.547-2.578 . Darapsky 12 also gives a few notes of observations on a few of the minerals from Atacama . Among these are aromite , paposite , amarantite , hohmannite , coquimbite , fibroferrite , nebrite , botryogen ...
... specific gravity = 2.547-2.578 . Darapsky 12 also gives a few notes of observations on a few of the minerals from Atacama . Among these are aromite , paposite , amarantite , hohmannite , coquimbite , fibroferrite , nebrite , botryogen ...
Page 16
... specific gravity of 3.149 , and a composition as follows : P2O 38.36 : FeO MnO 4.56 42.29 14 Amer . Jour . Sci . , Sep. , 1890 , p . 199 . 15 Amer . Jour . Sci . , Mch . , 1890 , p . 201 . 16 Ib . , 1880 , p . 257 . CaO H , O Quartz ...
... specific gravity of 3.149 , and a composition as follows : P2O 38.36 : FeO MnO 4.56 42.29 14 Amer . Jour . Sci . , Sep. , 1890 , p . 199 . 15 Amer . Jour . Sci . , Mch . , 1890 , p . 201 . 16 Ib . , 1880 , p . 257 . CaO H , O Quartz ...
Page 17
... specific gravity lying between 2.119 and 2.179 . 2 SiO , Al , O , FeO , CaO MgO K , O 3 Their analysis yields : Na , O H2O 66.40 11.17 -57 1.94 .17 3.58 2.27 13.31 10 24 which is equivalent to 3RAL , SiO2 + 20H , O , in which R ...
... specific gravity lying between 2.119 and 2.179 . 2 SiO , Al , O , FeO , CaO MgO K , O 3 Their analysis yields : Na , O H2O 66.40 11.17 -57 1.94 .17 3.58 2.27 13.31 10 24 which is equivalent to 3RAL , SiO2 + 20H , O , in which R ...
Page
... specific gravity is 7.011 , and its position in the systematic classification of minerals is with ullmannite.- -Sychnodymite is described by the same writer as a new cobalt - copper - sulphide from the Kohlenbach Mine , near Siegen ...
... specific gravity is 7.011 , and its position in the systematic classification of minerals is with ullmannite.- -Sychnodymite is described by the same writer as a new cobalt - copper - sulphide from the Kohlenbach Mine , near Siegen ...
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Common terms and phrases
acid Al,O alteration Amer AMERICAN NATURALIST analysis andalusite angle aragonite augite axial ratio basalts beryl biotite brucite Bull calcite calcium chlorite cleavage Colby University color colorless composition constituents containing cordierite corresponding crystalline crystals density described diabase double refraction dyke eruptive rocks Fe,O Fe₂O feldspar FeO MgO CaO FeO MnO forms formula Franc gabbro-diorites gabbros garnet Genth gneisses granite granulites ground-mass H₂O habit hexagonal hornblende humite hypersthene imbedded inclusions Jour Kryst leucite masses melanophlogite metacinnabarite mica mineral MINERALOGY AND PETROGRAPHY.¹ Mitth molecules muscovite Neues Jahrb nosean occur olivine optical original orthoclase ottrelite parallel Penfield Petrog PETROGRAPHY.¹ Petrographical phenacite plagioclase plane plates polymorphism prismatic produced pseudomorphs pyroxene quartz regarded rock individual Rosenbusch schistose schists serpentine silica sodium soluble specific gravity specimens spinel structure substance sulphur symmetry tabular temperature tonalite tourmaline twinned varieties W. S. Bayley Waterville yielded Zeits zircon zone
Popular passages
Page 19 - The plane of the optical axes is perpendicular to the plane of symmetry, and makes with c an angle of °7 in acute /9. A = b. 2H na = 104° 27'.
Page 14 - The larger part of the dust is thought to be a sediment from the air, and to have been obtained by it from a region of crystalline schists. The chondri, on the other hand, are thought to be of cosmic origin, since they are similar to the chondri obtained in deep-sea soundings. If the amount of the dust collected from the snow in Greenland represents the fall of one year, the total amount falling upon the entire surface of the earth in this time is 125 million kilograms, equivalent to a cube of thirty-one...
Page 14 - Wiilfing 21 for investigation, by whom it has been found to consist in greater part of feldspar, quartz, mica, and hornblende. There are present in it also garnet, zircon, magnetite, augite, and sillimanite, and with them is mixed a nitrogenous organic substance. The most interesting constituents of the dust...