Rocks And Rock Minerals a Manual of the Elements of Petrology Without the Use O
Rocks And Rock Minerals a Manual of the Elements of Petrology Without the Use O
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, where these have become exposed by dissective erosion. They are in origin subsequent to the main mass which they accompany and are found cutting it and also the surrounding rocks. In the latter, these minor intru- sions may appear, not only in the form of dikes, but also in intrusive sheets, laccoliths, etc. These rocks are divisible into two classes; in the first they are very poor or entirely wanting in ferromagnesian minerals (salic rocks) and have been called aplitic dikes, since the dike...s of aplite usually found associated with granites are the most common and best known representatives of this class. They have also been called leucocratic dikes (from the Greek, prevailing white) in allusion, to their general light color, due to the fact that they are mostly composed of feldspars or of these with quartz. They are generally 168 ROCKS AND ROCK MINERALS fine-grained rocks, sometimes of a sugar granular texture, sometimes dense and to be classed as felsites. In some cases they are porphyritic.
What to read after Rocks And Rock Minerals a Manual of the Elements of Petrology Without the Use O?
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To quickly assess the difficulty of the text, read a short excerpt:
, where these have become exposed by dissective erosion. They are in origin subsequent to the main mass which they accompany and are found cutting it and also the surrounding rocks. In the latter, these minor intru- sions may appear, not only in the form of dikes, but also in intrusive sheets, laccoliths, etc. These rocks are divisible into two classes; in the first they are very poor or entirely wanting in ferromagnesian minerals (salic rocks) and have been called aplitic dikes, since the dike...s of aplite usually found associated with granites are the most common and best known representatives of this class. They have also been called leucocratic dikes (from the Greek, prevailing white) in allusion, to their general light color, due to the fact that they are mostly composed of feldspars or of these with quartz. They are generally 168 ROCKS AND ROCK MINERALS fine-grained rocks, sometimes of a sugar granular texture, sometimes dense and to be classed as felsites. In some cases they are porphyritic.
What to read after Rocks And Rock Minerals a Manual of the Elements of Petrology Without the Use O?
You can find similar books in the "Read Also" column, or choose other free books by Pirsson, Louis V. (Louis Valentine), 1860-1919 to read onlineMoreLess
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