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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                           91
allow the cutting of even a small gem. The beryls from Monroe, Conn., often present interrupted curvatures as shown in Fig. 2. During the last twenty years many beryls, approaching those from New Hampshire in magnitude, have been found in other localites, chiefly in Oxford County, Me., in North Carolina, and in Amelia County, Va., all of which have furnished crystals from 2 to 4 feet in length and 1 foot or more in diameter. Only occasionally small spaces are clear enough to afford gems. Mr. Stephenson called the attention of the writer to a crystal of dark-green beryl, weighing 254 ounces, part of which would furnish gems of some size, that was found in January, 1888, near Russell Gap Road, Alexander County, N. C, by a farmer plowing. This locality is about ten miles from the Alexander County Emerald Mine, and is the largest beryl deposit affording gems that has been found in North Carolina. It is noteworthy that the highly modified beryls of this region occur rarely, and only when associated with spodumene or albite, and also that the white or pale-greenish beryls are found with the deepest green spodumene. It has before been noted that the quartz and beryl of Alexander County are more highly modified when implanted on the feldspathic layers of the walls of the pockets. Two emerald beryls, which were found in 1881, at a depth of 34 feet, were in a little pocket, the walls of which were almost covered with crystals of albite twinned parallel to the base. Only four emeralds were found, averaging about 1 centimeter in the three dimensions. The pocket was free from all decomposition what­ever. The crystals were of good color, transparent, and had their commoner planes well polished, but they differed to some extent in habit.1 Blue beryl in fine crystals that afforded fair gems was reported by William E. Hidden from Mitchell County, near the Yancey County line, N. C. In the State cabinet in Albany, N. Y., is a curious beryl found by S. C. Hatch at Auburn, Me. It is of imperfect structure and broken diagonally across, showing the structure to advantage. (See Fig. 2.) It is 8 1/2 inches, 30 centimeters high, 8 3/5 inches, 22
1 Am. J. Sci. III., Vol. 33, p. 505, June, 1887.
Ch. 6: Beryl (Emerald, Aquamarine), Chrysoberyl, Phenacite, & Euclase Page of 364 Ch. 6: Beryl (Emerald, Aquamarine), Chrysoberyl, Phenacite, & Euclase
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