Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . more accurate measurements. ORTHORHOMBIC SYSTEM. 49 will be horizontal, and the horizontal axis with the longer unitintercept will be placed to run from left to right, and called themacro or b axis ; the other axis will run from front to back and willbe called the brachy or S. axis. PYRAMIDAL CLASS 8. No. 25. Holohedry, Liebisch. No. 25. Normal Group, Dana. Almost all orthorhombic minerals crystallize in forms sym-metrical to three planes at right angles to each other, as in Fig. 182,the intersection
Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . more accurate measurements. ORTHORHOMBIC SYSTEM. 49 will be horizontal, and the horizontal axis with the longer unitintercept will be placed to run from left to right, and called themacro or b axis ; the other axis will run from front to back and willbe called the brachy or S. axis. PYRAMIDAL CLASS 8. No. 25. Holohedry, Liebisch. No. 25. Normal Group, Dana. Almost all orthorhombic minerals crystallize in forms sym-metrical to three planes at right angles to each other, as in Fig. 182,the intersections of these being axes of binary symmetry andchosen as the crystallographic axes. General Form or Pyramid. Composedof eight faces. Figs. 183 and 184, each of which cutsthe three axes in the same relative distances ; these intercepts arenever simple multiples of each other, but in crystals of the same sub-stance are necessarily simple multiples of the corresponding inter-cepts of the selected unit pyramid. In the ideal forms the facesare equal scalene triangles. Fig. 182. Fig. 183. Fig.
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