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Ch. 6: Beryl (Emerald, Aquamarine), Chrysoberyl, Phenacite, & Euclase

Ch. 6: Beryl (Emerald, Aquamarine), Chrysoberyl, Phenacite, & Euclase Page of 364 Ch. 6: Beryl (Emerald, Aquamarine), Chrysoberyl, Phenacite, & Euclase Text size:minus plus Restore normal size   Mail page  Print this page
UNITED STATES, CANADA AND MEXICO
99
Chatham, Ν. Η. Both localities have furnished crystals of sufficient size and quality to be cut into fair gems. The first occurrence of this mineral in the United States was mentioned by Whitman Cross and W. F. Hillebrand,' who published a short description and figure of a crystal occurring with mica and amazon-stone in El Paso County, Pike's Peak Range, Col., where some of the largest crystals in the United States have been found. The largest and finest phenacite crystal ever found in the United States is the one in the possession of Clarence S. Bernent. It is from Crystal Park, Col., and weighs 59 penny­weights and 6 grains, and measures nearly 2 inches (46.5 milli­meters) in length, and 1-1/5 inches (32 millimeters) in thickness. Occasional transparent spots are noticeable in it. A second locality is at Topaz Butte, near Florissant, about sixteen miles
from Pike's Peak. The crystals here are usually implanted on amazonstone and topaz. Many hundreds of them were found, varying in size from 1/25 inch to 4/5 inch (1 millimeter to 20 millimeters) in diameter, of which quite a number were transparent. They are often readily detached, or occur in a brown mass believed to be fayalite. The other Colorado locality is Mount Antero, where the crystals are found at an altitude
Am. J. Sci., III., Vol. 24, p. 282, Oct., 1882. See also full description of phenacites from Crystal Park and Florissant, Col., by Whitman Cross and W. F. Hillebrand in Bulletin No. 20, of the United States Geological Survey, Washington, 1885. Phenacite from the Florissant locality was described later by William E. Hidden, Am. J. Sci., III., Vol. 29, p. 249, March, 1885. The crystals at Florissant were first found by J. G. Heistand, of Manitou, Col. See Samuel L. Penfield, Am. J. Sci., III., Vol. 36, p. 320, Nov. 1888.
Ch. 6: Beryl (Emerald, Aquamarine), Chrysoberyl, Phenacite, & Euclase Page of 364 Ch. 6: Beryl (Emerald, Aquamarine), Chrysoberyl, Phenacite, & Euclase
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