Brauns, R. (Reinhard), 1861-1937, Spencer, Leonard James, 1870- · Esslingen a. N. : J. F. Schreiber · leaf 49
e rhombohedra, e. g., — 2 R, — \ R , etc. In the figures here given the positive rhombohedra are drawn with an upper face towards the observer (fig. 66), and the negative rhombohedra with an upper edge (fig. 67) towards the observer. It will now be clear that the three larger and brighter terminal… … Scalenohedron. Rhombohedron. Scalenohedron with enclosed rhombohedron. In this liemihedral class there is, besides the rhombohedron, an important form known as the scalenohedron (fig. 68). This may be derived from the twelve-sided hexagonal double pyramid by suppressing alternate faces. In this…
Mineralogy
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