Nature, Volume 39Nature Publishing Group, 1889 |
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Página 273
... crystals ; chemical analysis generally gave merely the composition of the total rock , and its minera- logical composition was only suspected . The intimate texture of the rock remained impenetrable ; it was im- possible to determine ...
... crystals ; chemical analysis generally gave merely the composition of the total rock , and its minera- logical composition was only suspected . The intimate texture of the rock remained impenetrable ; it was im- possible to determine ...
Página 274
... crystals during the very flow of the lava stream . When the cooling is extremely rapid , the microlites have no time to form , and the lava can produce only crystallites . But the microscope enables us to determine the chronology of the ...
... crystals during the very flow of the lava stream . When the cooling is extremely rapid , the microlites have no time to form , and the lava can produce only crystallites . But the microscope enables us to determine the chronology of the ...
Página 276
... crystals of leucite separ- ate . They evidently correspond to the first period of consolidation in eruptive rocks . The matter is then subjected during another forty - eight hours to the temperature of fused copper . All the mass , the ...
... crystals of leucite separ- ate . They evidently correspond to the first period of consolidation in eruptive rocks . The matter is then subjected during another forty - eight hours to the temperature of fused copper . All the mass , the ...
Índice
Launay L de Dilocations of Primitive Formations of North | 19 |
Lawson Inspector General R Deaths from Lightning 623 | 67 |
Holz Herr Dibromide of Crotonylene 467 | 71 |
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