Manual of Geology Theoretical And Practical volume 1
Manual of Geology Theoretical And Practical volume 1
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In our eReader you can find the full English version of the book. Read Manual of Geology Theoretical And Practical volume 1 Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Manual of Geology Theoretical And Practical volume 1
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These concretions vary in size from a pea to a water-melon, and, like all the others, owe their dark colour to the abundance of mica. They have a ground mass of quartz, felspar, and mica, and con- tain accidental minerals such as magnetite, titanite, apatite, and horn- blende. Occasionally, however, the patches, owing to the absence of black mica, are lighter in colour than the surrounding rock.
In the granite of Aberdeen, the pebble-like concretions are almost unknown. This granite consists of... orthoclase, a large proportion of oligoclase, quartz, white and black mica, minute garnets, and occasional crystals of apatite and sphene. The quartz is frequently traversed by hair-like crystals of rutile. Fragments of schistose rocks sometimes occur. Mr. Phillips describes one lenticular mass weighing over a hundredweight found in the Dyce quarry, north-west of Aberdeen. It was covered with a layer of mica so as readily to separate from the rock. On being broken the mass consisted of granite half as fine again in texture as the surrounding rock, and only differed in contain- ing more oligoclase.
What to read after Manual of Geology Theoretical And Practical volume 1?
You can find similar books in the "Read Also" column, or choose other free books by John Phillips to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
These concretions vary in size from a pea to a water-melon, and, like all the others, owe their dark colour to the abundance of mica. They have a ground mass of quartz, felspar, and mica, and con- tain accidental minerals such as magnetite, titanite, apatite, and horn- blende. Occasionally, however, the patches, owing to the absence of black mica, are lighter in colour than the surrounding rock.
In the granite of Aberdeen, the pebble-like concretions are almost unknown. This granite consists of... orthoclase, a large proportion of oligoclase, quartz, white and black mica, minute garnets, and occasional crystals of apatite and sphene. The quartz is frequently traversed by hair-like crystals of rutile. Fragments of schistose rocks sometimes occur. Mr. Phillips describes one lenticular mass weighing over a hundredweight found in the Dyce quarry, north-west of Aberdeen. It was covered with a layer of mica so as readily to separate from the rock. On being broken the mass consisted of granite half as fine again in texture as the surrounding rock, and only differed in contain- ing more oligoclase.
What to read after Manual of Geology Theoretical And Practical volume 1?
You can find similar books in the "Read Also" column, or choose other free books by John Phillips to read onlineMoreLess
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