Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . ning plane parallel to a: <xa?\c shaded, Fig. 253 showsthe twin with the reversed form shaded. Twinning Plane the Basal Pinacoid. In calcite and other minerals of the scalenohedral class, p. 39,the basal pinacoid is sometimes the twinning plane. Fig. 254 Fig. 254. Fig. 255. Fig. 256 Fig.

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