Mineralogy
Mineralogy
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In our eReader you can find the full English version of the book. Read Mineralogy 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 Mineralogy
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12oo.
-~=-n.
|K, Spartalite.
Cinnabar. Tellurium.
Millerite.
Dioptase. MiUerite.
158. False Cleavages. These are sometimes, and more pro- perly, called planes of union. They are formed when two or more crystals increase so as to come in contact. In such cases there is a sort of adhesion; but the compound mass breaks more readily between the crystals than elsewhere. As the broken surfaces so produced are often smooth and shining, they may be mistaken for true cleavages. They may however be easil...y distinguished, since with a true cleavage other lamellae may be readily split off parallel to the first one produced; but this is not so with false cleavages.
The cleavage of rocks is frequently quite a distinct pheno- mena to that of minerals ; but sometimes it is determined by the prevailing directions of the constituent minerals. Thus in mica schist the plates of mica have usually a prevailing direction, parallel to which the rock splits readily. In like manner, in many kinds of granite, the felspar crystals have a prevailing direction, which determines the " cleavage " of the CHAPTER XX.
What to read after Mineralogy?
You can find similar books in the "Read Also" column, or choose other free books by J H Joseph Henry Collins to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
12oo.
-~=-n.
|K, Spartalite.
Cinnabar. Tellurium.
Millerite.
Dioptase. MiUerite.
158. False Cleavages. These are sometimes, and more pro- perly, called planes of union. They are formed when two or more crystals increase so as to come in contact. In such cases there is a sort of adhesion; but the compound mass breaks more readily between the crystals than elsewhere. As the broken surfaces so produced are often smooth and shining, they may be mistaken for true cleavages. They may however be easil...y distinguished, since with a true cleavage other lamellae may be readily split off parallel to the first one produced; but this is not so with false cleavages.
The cleavage of rocks is frequently quite a distinct pheno- mena to that of minerals ; but sometimes it is determined by the prevailing directions of the constituent minerals. Thus in mica schist the plates of mica have usually a prevailing direction, parallel to which the rock splits readily. In like manner, in many kinds of granite, the felspar crystals have a prevailing direction, which determines the " cleavage " of the CHAPTER XX.
What to read after Mineralogy?
You can find similar books in the "Read Also" column, or choose other free books by J H Joseph Henry Collins to read onlineMoreLess
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