A popular guide to minerals : with chapters on the Bement Collection of minerals in the American Museum of Natural History, and the development of mineralogy . e equilateral triangular facestouches or cuts all of the three axes, andis parallel to none. In the cube o wasused in the formula, expressing the rela-tions of its faces to the structural axes,as pertaining to that face which touchedor intercepted an axis, and 00 or infinityas expressing its parallelism to the otheraxes. The eight faces of the octahedronFig. 2 are symmetrically disposed with regard to the three axes, (except as they lie
A popular guide to minerals : with chapters on the Bement Collection of minerals in the American Museum of Natural History, and the development of mineralogy . e equilateral triangular facestouches or cuts all of the three axes, andis parallel to none. In the cube o wasused in the formula, expressing the rela-tions of its faces to the structural axes,as pertaining to that face which touchedor intercepted an axis, and 00 or infinityas expressing its parallelism to the otheraxes. The eight faces of the octahedronFig. 2 are symmetrically disposed with regard to the three axes, (except as they lie in different octants) and, as theytouch or cut the three axes at equal distances from the origin, theformula for the octahedral form becomes o o o or simply o. Hadthese faces cut two of the axes at equal distances, but the third at adifferent (greater or less) distance from the origin the formulamight become m o o as in the trigonal trisoctahedron (See Fig. 3) orniom as in the tetragonal trisoctahedron (Fig. 4) or if they hadcut all axes unequally mo n as in the hexoctahedron (Fig. 5). TheOctahedron is made the primary form of the system to which it is.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmineral, bookyear1912
