Aids in Practical Geology |
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Page 33
... silica . The silica separates either in a powdery or a gelatinous condition , the jelly of silicic hydrate being often well seen after partial evaporation and cooling of the liquid . The mass clings to the test - tube , but may be ...
... silica . The silica separates either in a powdery or a gelatinous condition , the jelly of silicic hydrate being often well seen after partial evaporation and cooling of the liquid . The mass clings to the test - tube , but may be ...
Page 34
... silica can now be filtered off , and the bases in the solution are ready for any further experiments . The commonest and most important use to which acids are put by the geologist is , however , in the examination of carbonates . A free ...
... silica can now be filtered off , and the bases in the solution are ready for any further experiments . The commonest and most important use to which acids are put by the geologist is , however , in the examination of carbonates . A free ...
Page 35
... silica . - Nepheline , analcime , stilbite , and wollastonite yield silica in a cold solution ( long standing is desirable ) , becoming partially decomposed ; natrolite and hemi- morphite are decomposed with gelatinisation . Serpentine ...
... silica . - Nepheline , analcime , stilbite , and wollastonite yield silica in a cold solution ( long standing is desirable ) , becoming partially decomposed ; natrolite and hemi- morphite are decomposed with gelatinisation . Serpentine ...
Page 52
... SILICA IN BEAD OF MICROCOSMIC SALT . If a minute splinter of a silicate is placed in the bead and heated thus for a long period , the silica will still remain undissolved , and will be seen floating about as a skeleton retaining the ...
... SILICA IN BEAD OF MICROCOSMIC SALT . If a minute splinter of a silicate is placed in the bead and heated thus for a long period , the silica will still remain undissolved , and will be seen floating about as a skeleton retaining the ...
Page 53
... silica eventually dissolves , in common with the bases combined with it . A small portion of the silica is said to be dissolved out even in the bead of micro- cosmic salt , but this does not vitiate the observation unless a tine powder ...
... silica eventually dissolves , in common with the bases combined with it . A small portion of the silica is said to be dissolved out even in the bead of micro- cosmic salt , but this does not vitiate the observation unless a tine powder ...
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Common terms and phrases
abundant acid altered amphibole andesites angle appear aragonite areas assay augite axis basal bead become biotite blue brown calcareous calcite carbonate Carboniferous cavities character cleavage cobalt colour colourless common commonly compact constituents Cretaceous crossed nicols crystalline crystals dark decomposed deposits developed Devonian elongated encrustation eurites felspar fibrous flame foliated forms fossils fragments garnet Geol glass Gotlandian grains granite granular granules green groundmass H Cl hinge-line hornblende igneous rocks iron Journ Jurassic lavas leucite limestones lithoidal magnetite margin marked mass mica microscope minerals minute nepheline occur olivine opaque ophitic optic ordinary Ordovician orthoclase oxide pale parallel Plagioclase planes plates pleochroism polarised porphyritic posterior powder prismatic prisms pyroxene quartz radial reaction Refr refractive resemble rhombic rhyolites schists sections seen septa serpentine shell silica soda sometimes specific gravity specimens spherulites spicules structure sulphur surface thick trace trachytic tube types typical umbo ventral
Popular passages
Page 63 - Micro-Structure of Metals and Alloys. — Economic Considerations. " No English text-book at all approaches this in the COMPLETENESS with which the most modern views on the subject are dealt with. Professor Austen's volume will be INVALUABLE, not only to the student, but also to those whose knowledge of the art is far advanced.
Page 33 - TRAVERSE TABLES: Computed to Four Places of Decimals for every Minute of Angle up to 100 of Distance. For the Use of Surveyors and Engineers. BY RICHARD LLOYD GURDEN, Authorised Surveyor for the Governments of New South Wales and Victoria, *»* Published with the Concurrence oj the Surveyors- General for New South Wales and Victoria. "Those who have experience in exact SURVEY-WORK will best know how to appreciate the enormous amount of labour represented by this valuable book.
Page 35 - A MANUAL OF APPLIED MECHANICS : Comprising the Principles of Statics and Cinematics, and Theory of Structures, Mechanism, and Machines. With Numerous Diagrams. Crown 8vo, cloth, 12s. 6d. FOURTEENTH EDITION. II. A MANUAL OF CIVIL ENGINEERING : Comprising Engineering Surveys, Earthwork, Foundations, Masonry, Carpentry, Metal Work, Roads, Railways, Canals, Rivers, Waterworks, Harbours, &c.
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