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Ch. 9: The Feldspar Group, including Amazonite, Moonstone, Sunstone, etc.

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170
GEMS AND PRECIOUS STONES IN THE
color of the different varieties recommended its use in the arts, and it exists in such immense quantities that it should receive some attention from jewelers and decorators.
Pitchstone is a variety having the lustre of pitch rather than glass. Pitchstones are often albite or oligoclase rather than or-
OBSIDIAN
thoclase ; that is, they contain soda, or soda and lime, instead of potash as a base.
The best known crystals of chondrodite, and the finest known gems cut from this material, have been found at the Tilly Foster Mine, Brewster, Ν. Υ. Recent working has brought to light transparent, garnet-colored crystals, measuring 1/2 by 1/2 inch, and a few over 4 inches across. One essonite-colored crystal is 1/4 inch
CHONDRODITE
across. Others, still uncut, would furnish fine gems. The finest of these crystals are in the Allen Cabinet, now at the Johns Hop­kins University, in Baltimore, Md., and in the Mineralogical Cab­inet of the Peabody Museum, New Haven, Conn. The cabinets of Frederick A. Canfield and Clarence S. Bernent also contain
Ch. 9: The Feldspar Group, including Amazonite, Moonstone, Sunstone,  etc. Page of 364 Ch. 9: The Feldspar Group, including Amazonite, Moonstone, Sunstone,  etc.
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Kunz. Precious Stones of North America.
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