A text-book on chemistryFor the use of schools and colleges . octahedron ; and, 3. Rhombic dodecahedron. THE SQUARE PRISMATIC SYSTEM. This has three axes, two of which are equal and thethird of a different length. Fig. 172. >-• H. > &=& a\7. What are the six systems of crystallization? Upon what is thisdivision founded? In the regular system, what is the relation ofthe axes? In the square prismatic system, what is their relation? 206 SYSTEMS OF CRYSTALLIZATION. a a is the principal axis, b b the secondary one. Inthe figure {Fig. 172), 1 is a right square prism, with theaxes on the center
A text-book on chemistryFor the use of schools and colleges . octahedron ; and, 3. Rhombic dodecahedron. THE SQUARE PRISMATIC SYSTEM. This has three axes, two of which are equal and thethird of a different length. Fig. 172. >-• H. > &=& a\7. What are the six systems of crystallization? Upon what is thisdivision founded? In the regular system, what is the relation ofthe axes? In the square prismatic system, what is their relation? 206 SYSTEMS OF CRYSTALLIZATION. a a is the principal axis, b b the secondary one. Inthe figure {Fig. 172), 1 is a right square prism, with theaxes on the center of the sides, b b; 2 is a right squareprism, with the axes in the edges; 3 and 4, correspond-ing right square octahedrons. THE EIGHT PRISMATIC SYSTEM has three axes, a a,b b,c c, of unequal lengths, at rightangles to each other. In the figure {Fig. 173), 1 is a right rectangular Fig. 1T3.
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