Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . Twinning Plane a Pyramid Face. Fig. 262 shows a staurolite crystal with twin plane |^: b : \cshaded. Fig. 263 shows the corresponding interpenetration twin. yo CR YSTALLOGRAPHY. MONOCLINIC JTWINS. • The plane of symmetry will not be a twin plane, any other may be. ^ , • • » Twinning Plane the Orthopmacotd. Fig. 264. Fig. 265. This is the most common type. Fig. 264 shows a gypsum crystal with ashaded plane parallel to the orthopina-coid, and Fig. 265 shows the correspond-ing contact twin. Fig. 266 sho
Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . Twinning Plane a Pyramid Face. Fig. 262 shows a staurolite crystal with twin plane |^: b : \cshaded. Fig. 263 shows the corresponding interpenetration twin. yo CR YSTALLOGRAPHY. MONOCLINIC JTWINS. • The plane of symmetry will not be a twin plane, any other may be. ^ , • • » Twinning Plane the Orthopmacotd. Fig. 264. Fig. 265. This is the most common type. Fig. 264 shows a gypsum crystal with ashaded plane parallel to the orthopina-coid, and Fig. 265 shows the correspond-ing contact twin. Fig. 266 shows an in-terpenetrating so-called Carlsbad twinof plane the Basal Pinacoid. Fig. 267 shows the so-called Manne-bacher twin of orthoclase.
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