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

Ch. 9: The Feldspar Group, including Amazonite, Moonstone, Sunstone, etc. Page of 364 Ch. 9: The Feldspar Group, including Amazonite, Moonstone, Sunstone, etc. Text size:minus plus Restore normal size   Mail page  Print this page
172
GEMS AND PRECIOUS STONES IN THE
tals occur in a quartzite vein in a brown mica schist, and scattered through it are small crystals of pyrrhotite.1
Among the many valuable ethnological additions to the United States National Museum, consequent upon the acquisition of Alaska, is that of a series of highly interesting objects, con­sisting of drills, adzes, and knife-sharpeners, collected at Point Barrow, Capes Nome and Prince of Wales, and at St. Michael's, Sledge and Diomede Islands. Prof. Frank W. Clarke found by analysis that these objects were true jadeite or nephrite.* A mineral was also found which was mistaken for jade, but was determined by analysis to be pectolite. (See Pectolite.) The jade was generally coarse in quality, but among the objects were some with a high finish, some translucency, and great beauty. In color they were yellowish green, olive-green, siskin-green, and blackish green. A critical analytical and microscopical examina­tion at the laboratory of the United States Geological Survey gave the following results :'
As regards origin, some early writers have attributed the Alaska nephrite to Siberian sources, but of late years it has been generally ascribed to a home locality. Native reports pointed to a source known as the Jade Mountains, north of the Kowak
1 Andalusite from a New American Locality, by George F. Kunz, Proc. Am. Ass'n. Adv. Sci. Vol. 32, p. 270, Salem, 1883.
s Am. J. Sci. III., Vol. 28, p. 20, July, 18S4. 3 Proc. U. S. Nat. Mus. 1888, p. 115.
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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