A Summary of Progress in Petrography. in 1887-1896 |
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Page 10
... Analyses of several kinds of oölites are given in the paper . = New Minerals . - Castanite , associated with barite occurs on a copiapite specimen from Sierra Gordo , Chili , in the form of large , brown , prismatic crystals , without ...
... Analyses of several kinds of oölites are given in the paper . = New Minerals . - Castanite , associated with barite occurs on a copiapite specimen from Sierra Gordo , Chili , in the form of large , brown , prismatic crystals , without ...
Page 11
... analysis of the hydrochloric acid solution yielded : Fe , O , CaO PbO SiO , H2O 2.07 1.09 .76 1.21 .47 B2O , MgO Mn , 15.65 28.58 49.39 Correcting for silica and water , the formula becomes R , BMnO ,, or a manganese ludwigite . The ...
... analysis of the hydrochloric acid solution yielded : Fe , O , CaO PbO SiO , H2O 2.07 1.09 .76 1.21 .47 B2O , MgO Mn , 15.65 28.58 49.39 Correcting for silica and water , the formula becomes R , BMnO ,, or a manganese ludwigite . The ...
Page 14
... analysis of them leads to the conclusion that they are all of the chemi- cal type of common garnet . Sodalite is Na , ( AICI ) Al , ( SiO ) , and nosean is Na , [ Al ( NaSO , ) ] Al , ( SiO ) ,. In hauyne , calcium replaces some of the ...
... analysis of them leads to the conclusion that they are all of the chemi- cal type of common garnet . Sodalite is Na , ( AICI ) Al , ( SiO ) , and nosean is Na , [ Al ( NaSO , ) ] Al , ( SiO ) ,. In hauyne , calcium replaces some of the ...
Page 16
... analyses of picropharmacolite from Joplin , Mo. , of a substance supposed to be from near = 16 Georgetown , N. M .; of pitticite from the Clarissa Mine , in the Tintic District , Utah ; and of gibbsite from White Horn Station , Chester ...
... analyses of picropharmacolite from Joplin , Mo. , of a substance supposed to be from near = 16 Georgetown , N. M .; of pitticite from the Clarissa Mine , in the Tintic District , Utah ; and of gibbsite from White Horn Station , Chester ...
Page 17
... analysis yielded Mr. Wells : P2O FeO MnO 34.90 17.13 34.51 CaO H2O Quartz . .63 13.18 .13 17 a result expressed by the formula ( FeMn ) , ( PO , ) , + 3H , O . Fairfieldite is in transparent foliated masses of a whitish or greenish ...
... analysis yielded Mr. Wells : P2O FeO MnO 34.90 17.13 34.51 CaO H2O Quartz . .63 13.18 .13 17 a result expressed by the formula ( FeMn ) , ( PO , ) , + 3H , O . Fairfieldite is in transparent foliated masses of a whitish or greenish ...
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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...