A Summary of Progress in Petrography. in 1887-1896 |
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Page 8
... 1 Edited by Dr. W. S. Bayley , Colby University , Waterville , Me . 2 Bull . des Serv . d . 1. Carte . gèol . d . France , No. 11 , T. II . The peridotite contains hypersthene and amphibole . Its olivine is STAMFORD ...
... 1 Edited by Dr. W. S. Bayley , Colby University , Waterville , Me . 2 Bull . des Serv . d . 1. Carte . gèol . d . France , No. 11 , T. II . The peridotite contains hypersthene and amphibole . Its olivine is STAMFORD ...
Page 9
William Shirley Bayley. The peridotite contains hypersthene and amphibole . Its olivine is perfectiỳ fresh , and is in irregular grains imbedded in the amphiboloids . Some of the granulites contain corroded crystals of bright red andalu ...
William Shirley Bayley. The peridotite contains hypersthene and amphibole . Its olivine is perfectiỳ fresh , and is in irregular grains imbedded in the amphiboloids . Some of the granulites contain corroded crystals of bright red andalu ...
Page 24
... olivine . Carefully examined , the ground - mass is found to be a colorless glass containing microlites of the same minerals as occur in the phenocrysts , and occasionally a few laths of plagioclase . The glassy base has a composition ...
... olivine . Carefully examined , the ground - mass is found to be a colorless glass containing microlites of the same minerals as occur in the phenocrysts , and occasionally a few laths of plagioclase . The glassy base has a composition ...
Page
... 48 extinction of crystallograp slightly from of the zinc is Si 46 . correspondi many analys Amer . Jou 5 Ib . , Dec. , Ib . , XL . , I diabase , and the other an olivine - hypersthene - 1891. ] 828 Mineralogy and Fetrography . 827.
... 48 extinction of crystallograp slightly from of the zinc is Si 46 . correspondi many analys Amer . Jou 5 Ib . , Dec. , Ib . , XL . , I diabase , and the other an olivine - hypersthene - 1891. ] 828 Mineralogy and Fetrography . 827.
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... Olivine = tine = Mg or olivine v 22 Ib . , Feb. 23 Ib . , Mar 24 Ib . , Mar 25 Ib . , Nov 26 Ib . , 1890 penetration twins , with the base the twinning plane . 1891. ] Mineralogy and Petrography . 829 830.
... Olivine = tine = Mg or olivine v 22 Ib . , Feb. 23 Ib . , Mar 24 Ib . , Mar 25 Ib . , Nov 26 Ib . , 1890 penetration twins , with the base the twinning plane . 1891. ] Mineralogy and Petrography . 829 830.
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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...