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Ch. 1: Form of Minerals

Ch. 1: Form of Minerals Page of 515 Ch. 1: Form of Minerals Text size:minus plus Restore normal size   Mail page  Print this page
44
A PRACTICAL TREATISE ON GEMS.
The combinations of rhombohedric forms are very nu­merous, some hundreds being described in calc-spar alone. Among the more common is the prism in combination with a rhombohedron, as in the twin crystal of calc-spar (fig. 43),
with the sign the lower half being the same
form with the upper, but turned round 180°. In figure 44, the rhombohedron mil has its polar edges replaced by
another rhombohedron; and in figure 45 its lateral
edges bevelled by the scalenohedror A more com-
Ch. 1: Form of Minerals Page of 515 Ch. 1: Form of Minerals
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