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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
FORM OF MINERALS.
43
but on several grounds it is found better to designate it by R or mR, and its complimentary figure by — mR. When the prism or pinacoid arise as its limiting forms, they are designated byand OR, though in no respect changed
from the limiting formsand OP of the pyramid. The
scalenohedron is properly the hemihedric form of the dihexagonal pyramid, but is better derived from the inscribed rhombohedron ?«R. If the halves of the prin­cipal axis of this are multiplied by a definite number n,
and then planes drawn from the extremities of this enlarged axis to the lateral edges of the rhombohedron, as in figure 42, the scalenohedron is constructed. Hence it is desig­nated bythe η being written on the right hand, like an algebraic exponent : and the dihexagonal prism is in like manner designated by
Ch. 1: Form of Minerals Page of 515 Ch. 1: Form of Minerals
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