Brauns, R. (Reinhard), 1861-1937, Spencer, Leonard James, 1870- · Esslingen a. N. : J. F. Schreiber · leaf 331
PYROXENE GROUP (AUG1TE). 315 The simple crystals, as well as the twins, possess a very characteristic form, and it is easy to recognize that they have only one plane of symmetry and are consequently monoclinic. With the unit vertical prism (m in text-fig. 231) is combined the ortho-pina- coid a and… … consider the simple crystal (fig. 231) Twinned crystal of Augite. Simple crystal of Augite. to be cut into two equal halves by a plane parallel to a, and then rotate the front half through 180° about a normal to this plane, we shall obtain the twinned crystal (fig. 232). The characteristic feature…
Mineralogy
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