Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . Fig. 267. Fig. 268. /\~—;-~^V\ C . ^^^-^ ; A J 1 V xL—^ V a \ ,--••- --J:^ -V 7 7t\ / --^ / Twinning Plane a Dome Face. Fig. 268 shows the so-called Baveno twin of orthoclase, thetwinning plane being parallel to the clinodom 00 a?2c. TRICLINIC TWINS. Twinning Plane the Brachy any face may be a twinning plane, the brachy pina- FiG. 269. Fig.

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