Crystallography; an elementary manual for the laboratory

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 edition. Excerpt: ... that it is parallel to O, or 111, when it is octahedral; or in every case it is usual to employ the symbols of the crystal planes that are parallel to the cleavage planes. The principal cleavages in each system are given below. TRICLINIC CLEAVAGE In the Triclinic system the cleavage is chiefly Pinacoidal, and less commonly Prismatic. The usual symbols are as follows: 1. Basal Cleavage, 0 P, O or c, 001. 2. Brachypinacoidal Cleavage, oo P oo, i-i or b, 010. 3. Macropinacoidal Cleavage, oo P oo, i-1. or a, 100. f oo P', I' orm, 110. 4. Hemiprismatic Cleavage ( p-Ti u u j ni f f' 0=, 1-1,011. 5. Hemibrachydomatic Cleavage' MONOCLINIC CLEAVAGE In the Monoclinic System the most common cleavages are Pinacoidal and Prismatic. The chief cleavages and their symbols are as follows: 1. Basal Cleavage, 0 P, O or c, 001. 2. Clinopinacoidal Cleavage, oo P do, i-fr or b, 010. 3. Orthopinacoidal Cleavage, oo P Go, i-i or a, 100. 4. Prismatic Cleavage, cc P, Jor m, 110. 5. Clinodomatic Cleavage, P ob, l-i, 0il., l-l, 101. ORTHORHOMBIC CLEAVAGE In the Orthorhombic system the most common cleavages are Pinacoidal and Prismatic. The symbols and most cleavages in this system are: 1. Basal Cleavage, 0P, O or c, 001. 2. Brachypinacoidal Cleavage, oo P oo, i-i or b, 010. 3. Macropinacoidal Cleavage, oo P oo, i-I or a, 100. 4. Prismatic Cleavage, oo P, /or m, 110. 5. Brachydomatic Cleavage, Poo, l-i, 0il. 6. Macrodomatic Cleavage, P co,-, 101. TETRAGONAL CLEAVAGE In the Tetragonal system the common cleavages are Pinacoidal and Prismatic, with the more rarely occurring Pyramidal. Their symbols are as follows: 1. Basal Cleavage, 0P, O or c, 001. 2. Primary Prismatic Cleavage, oo P, /or m, 110. 3. Secondary Prismatic Cleavage, co P oo, i-i or a, 100. 4. Primary Pyramidal...