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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
etrate, partly are in mere juxtaposition, as in fig. S3, where the individuals are formed by the Combination
and in figure 84 where several crystals of the same combination form a series with parallel planes of union ; the inner members being so shortened that they appear like mere lamellar plates producing strife on the faces of the made. In fig. 85 four crystals,
each of the combination having united in in-
clined planes, form a circular group, returning into itself. The carbonate of lead often occurs in macles in all respects
similar. In staurolite, individuals of the prismatic eombi-tion combine either, as in fig. 86, by a
face of the brachydomewith their
chief axes almost at right angles ; or, as in fig. 87, by a face of the brachypyramid
the chief axes and the brachypina-coids (o) of the two single crystals meeting at an angle of about 60°. Finally, in fig. 88, two harmotome crystals of the most common combination
intersect each other so nearly at right angles, that their principal axes seem to coincide, and the brachypinacoid (q) of the one crystal
Ch. 1: Form of Minerals Page of 515 Ch. 1: Form of Minerals
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