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Ch. 16: Tourmaline, Garnet, Zircon etc.

Ch. 16: Tourmaline, Garnet, Zircon etc. Page of 401 Ch. 17: Labradorite and other Gems Text size:minus plus Restore normal size   Mail page  Print this page
324                                  PRECIOUS STONES.
Apophyllite. — This substance is sometimes classed with
gem-minerals, but its deficiency in hardness, ranking only
from 4 to 5, renders its use for jewelry very doubtful. The
name is derived from its tendency to exfoliate under the
blow-pipe. It is generally transparent, white or gray, occasionally tinged with green, yellow, or red, and has a pearly
lustre resembling the eye of a fish, whence it is sometimes
called "fish-eye stone." It occurs in India, the Harz Mountains, Greenland, Iceland, Mexico, the United States, and
other localities.
Ch. 16: Tourmaline, Garnet, Zircon etc. Page of 401 Ch. 17: Labradorite and other Gems
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