Brauns, R. (Reinhard), 1861-1937, Spencer, Leonard James, 1870- · Esslingen a. N. : J. F. Schreiber · leaf 54
axis and the clino-axis. Its symbol is oo P &*>. The ortho- pinacoid also consists of a pair of parallel faces placed at the front and the back of the crystal, being parallel to the vertical axis and the ortho-axis. Its symbol is =« P &>. The basal pinacoid or base consists of a pair of faces… … according to our choice of the vertical a m m axis and the clino-axis. For each mineral it is necessary therefore to make an arbitrary selection of these axes, and having made the selection to adhere to it for the same mineral. Fig. 83. Fig. 82. In the crystal of augite shown in Monoclinic crystal…
Mineralogy
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