. Bulletin - New York State Museum. Science. GUIDE TO THE MINERALOGIC COLLECTIONS 15. Trisoctahedron. The trisoctahedron (fig. 33) is composed of 24 faces, each of which cuts two axes at equal distances and the third at a distance which is relatively greater. The faces are isosceles triangles and are disposed in groups of eight about the axes of tetragonal symmetry and in groups of three about the axes of trigonal symmetry. The trisoctahedron is occa- sionally found in combination with other - . , Fig. 33 tonus as in galena. Trapezohedron. The trapezohedron (fig. 34) is composed of 24 faces ea
. Bulletin - New York State Museum. Science. GUIDE TO THE MINERALOGIC COLLECTIONS 15. Trisoctahedron. The trisoctahedron (fig. 33) is composed of 24 faces, each of which cuts two axes at equal distances and the third at a distance which is relatively greater. The faces are isosceles triangles and are disposed in groups of eight about the axes of tetragonal symmetry and in groups of three about the axes of trigonal symmetry. The trisoctahedron is occa- sionally found in combination with other - . , Fig. 33 tonus as in galena. Trapezohedron. The trapezohedron (fig. 34) is composed of 24 faces each of which cuts two axes at equal distances and the third at a distance which is relatively less. Garnet, leucite, analcite and other minerals crystallize in trapezohedrons. Of the above named crystal forms the cube, dodecahedron and octahedron alone present an unvarying constancy of form, the cube and octahedron being identical with the familiar geometric forms. In the hexoctahedron, tetrahexahedron, trisoc- tahedron and trapezohedron the variations in the relative values of the axial intercepts give rise to a number of variations under. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original New York State Museum; New York State Museum. Albany : New York State Education Dept
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