The Study of Rocks An Elementary Text book of Petrology
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These consist sometimes of two curved lines, with their convex aspects directed inwards, and often approximating or being in actual contact, the lines seerm'ng to spring from the lateral edges of the crystal, while at others they consist of a straight median line or rib which traverses the crystal for some distance, and then suddenly bifurcates, the bifur- cations passing in straight lines to the opposite lateral edges or corners of the crystal section. These larger divi- sional markings, wheth...er curved or rectilinear, are crossed by other mark- ings or striae, which are usually very numerous, often extremely delicate, and always observe definite direc- tions ; but, as the angles made by their intersections vary very considerably in different crystals, it is unsafe at present to hazard any conjectures as to the relation which they bear to general recognised crystalline structure. 1 Microcline In the blue, chatoyant felspar of the zircon syenite of Norway the angles of intersection of the principal cleavages are, according to Breithaupt, 90 22' to 90 23', so that in this respect it differs slightly from the cleavage of orthoclase.
What to read after The Study of Rocks An Elementary Text book of Petrology?
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To quickly assess the difficulty of the text, read a short excerpt:
These consist sometimes of two curved lines, with their convex aspects directed inwards, and often approximating or being in actual contact, the lines seerm'ng to spring from the lateral edges of the crystal, while at others they consist of a straight median line or rib which traverses the crystal for some distance, and then suddenly bifurcates, the bifur- cations passing in straight lines to the opposite lateral edges or corners of the crystal section. These larger divi- sional markings, wheth...er curved or rectilinear, are crossed by other mark- ings or striae, which are usually very numerous, often extremely delicate, and always observe definite direc- tions ; but, as the angles made by their intersections vary very considerably in different crystals, it is unsafe at present to hazard any conjectures as to the relation which they bear to general recognised crystalline structure. 1 Microcline In the blue, chatoyant felspar of the zircon syenite of Norway the angles of intersection of the principal cleavages are, according to Breithaupt, 90 22' to 90 23', so that in this respect it differs slightly from the cleavage of orthoclase.
What to read after The Study of Rocks An Elementary Text book of Petrology?
You can find similar books in the "Read Also" column, or choose other free books by Frank Rutley to read onlineMoreLess
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