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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
97
of the composite crystals of which the latter is made up, or the twinning of the crystal; or when certain minerals have been de­posited between the layers during crystallization, the stone, being cut en cabochon across these lines, exhibits the phenomenon. The stellate effect frequently produced by the twinning of chryso-beryl is shown in Fig. 4. Alexandrite was named after Alex­ander I., Czar of Russia, on whose birthday it was discovered. Large crystals that occasionally furnish gems are found in Takowaja, Siberia. Fine gems, up to 67 carats each, have been found during the last ten years in the kingdom of Kandy, Ceylon, associated with the true cat's-eye, and the yellow, brown, and green chrysoberyl. This is also found in the alexandrite variety, but it is extremely rare. Beautiful light-golden chrysoberyls (the chrysolite of the jeweler, valued at nearly as high a rate as the
FIG. 4. STELLATE EFFECTS FREQUENTLY PRODUCED BY THE TWINNING OF THE CHRYSOBERYL.
diamond in the time of Louis XIV.) have been found in Brazil, also fine light-yellow cat's-eyes.
Chrysoberyl, of sufficient transparency to be of gem value, is not found in North America. It has been found at Stoneham, also at Canton, Peru, Norway, and Stow, Me., but thus far not in fine specimens. Some of the small yellow crystals occurring in the fibrolite at Stoneham are, however, quite perfect in form. Small crystals occur at Canton and Stow, Me., together with large, coarse crystals. At Stow' it has been found in masses weighing about 5 pounds each. A single distorted crystal 3 by 5 by 1 inches, opaque, and of a dull yellow-gray color, has also been found, which may in part furnish very poor chryso­beryl cat's-eye. Nathaniel H. Perry found one small, very perfect crystal at Tubb's Ledge, Me., and it has also been observed at
1 Trans. N. Y. Acad. Sci., Vol. 2, p. 64, Jan. 22, 1883.
Ch. 6: Beryl (Emerald, Aquamarine), Chrysoberyl, Phenacite, & Euclase Page of 364 Ch. 6: Beryl (Emerald, Aquamarine), Chrysoberyl, Phenacite, & Euclase
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