Bulletin of the United States Geological Survey--Corundum and Its Occurrence and Distribution in the United States (A Revised and Enlarged Edition of Bulletin ) . d a stone of anyreal merit as a ruby gem. At the Laurel Creek mine, Rabun County,at the Hiawassee mine, ToAvns County, and from near Caldwell,Union County, pink to ruby-red corundum of good color has beenfound, some of which is translucent to semitransparent, making veryhandsome mineral specimens. MONTANA. Montana has, next to North Carolina, been the most productiveState in rubies, and it is the first State in the total value
Bulletin of the United States Geological Survey--Corundum and Its Occurrence and Distribution in the United States (A Revised and Enlarged Edition of Bulletin ) . d a stone of anyreal merit as a ruby gem. At the Laurel Creek mine, Rabun County,at the Hiawassee mine, ToAvns County, and from near Caldwell,Union County, pink to ruby-red corundum of good color has beenfound, some of which is translucent to semitransparent, making veryhandsome mineral specimens. MONTANA. Montana has, next to North Carolina, been the most productiveState in rubies, and it is the first State in the total value of its pro-duction of corundum gems, of whichthe oriental sapphire constitutes thelargest amount. Rubies of a rich redcolor have been found in the gravelsof the upper waters of Rock or StonyCreek, Granite County, and in lessamount in the gravels of CottonwoodCreek, Deerlodge County. The rubiesare found in these gravels associatedAvith other colors of corundum, andthey form but a very small percent-age of the total corundum gems ob-tained. The majority of the gemsfound at these two localities are pale-green, yellow, pink, or from bluish-white to nearly Fig. 14.—Corundum crystal, showing• concentric hexagons on basal plane. SAPPHIRE. NORTH CAROLINA. No corundum gems were found in the United States until theopening of the Corundum Hill (corundum mine at Cullasagee, MaconCounty, N. C, in 1871. This corundum is mined for abrasive pur-poses, but in certain parts of the deposit crystal corundum is occa-sionally found that is of a decided gem character, and, again, manyof the fragments of the corundum have certain portions that aretransparent. A number of very handsome dark-blue sapphires fromthis mine are in the United States National Museum, one of whichweighs a carat.« Kunz, G. F., fienis and Precious Stones of North America, 1890, p. 40. 106 CORUNDUM, TTS OCCURRENCE AND DTSTRTBUTTON. Yellowish and blue colors in the same specimen are rather commonand are sometimes
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