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Ch. 5: Quartz

Ch. 5: Quartz Page of 296 Ch. 5: Quartz Text size:minus plus Restore normal size   Mail page  Print this page
148
PRECIOUS STONES.
the substances most frequently occurring upon the surface of the earth, and probably also in its interior. " It forms," says an English writer, " about one-third of the mass of those immovable hills whose summits pierce the clouds, and nearly the whole of the mobile soil of the trackless desert rolling with the wind like the waves of the sea."
Crystals of quartz do not often occur of dimen­sions sufficiently great to attract the eyes of the common observer. Some magnificent specimens, however, are found in the ancient formations, which, as we have mentioned, are formed principally of silica: here indeed we would naturally look for them; but that which would seem much less pro­bable, and yet actually occurs, is the presence of
Ch. 5: Quartz Page of 296 Ch. 5: Quartz
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