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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.
47
without reference to the relative magnitude of the derived axes.
By multiplying the principal axis by any rational num­ber m, greater or less than 1, a series of pyramids arise, whose general sign is mP, and their limits the prism and pinacoid, the whole series being contained in this formula,
which is
the fundamental series, the lateral axes always remaining unchanged. From each member a new series may, however, be developed in two directions by increas­ing one or other of the lateral axes. When the macrodia­gonal is thus multi­plied by any number η greater than 1, and planes drawn from the distance η to the polar edges, a new pyramid is produced, named a macropyra-mid, with the sign the mark ov«r the Ρ pointing out the axis enlarged. Whera ma-
crodome results, with
the sign If the shorter axis is multiplied, then bra-
chypyramids and brachydomes are produced with the signs ìSo also from the prismon the one
side, numerous macroprismswith the limiting ma-
Ch. 1: Form of Minerals Page of 515 Ch. 1: Form of Minerals
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