. Bulletin - United States National Museum. Science. 56 BULLETIN 118, UNITED STATES NATIONAL MUSEUM. morphism. Demantoid occurs in serpentine. The chrome garnets belong particularly to serpentine; found also in granular limestone. The mineral is widely used as a semiprecious stone, although the color is in some cases so deep that it is not much in favor. The most noted garnet region of the world is that some 60 kilometers north of Prague in Bohemia. For many years this has been almost the only commercial source of the common ruby garnet found mounted in various and multiple forms in the jewele
. Bulletin - United States National Museum. Science. 56 BULLETIN 118, UNITED STATES NATIONAL MUSEUM. morphism. Demantoid occurs in serpentine. The chrome garnets belong particularly to serpentine; found also in granular limestone. The mineral is widely used as a semiprecious stone, although the color is in some cases so deep that it is not much in favor. The most noted garnet region of the world is that some 60 kilometers north of Prague in Bohemia. For many years this has been almost the only commercial source of the common ruby garnet found mounted in various and multiple forms in the jewelers' shops. Of late years a great many very beautiful garnets have been brought in from the Indian Reservations in Arizona and New Mexico, where they are gathered from the loose sands and gravels which result from 1 .JT-. Fig. 6.—Garnets in matrix. a decomposition of boulders of garnetiferous gneiss which, according to Gregory,1 have been brought from an unknown depth to the sur- face by igneous injections. These are often of no mean quality and are popularly spoken of as Arizona rubies. The principal localities are the Mule Ear and Moses Rock fields in southern Utah and the Garnet Ridge field in the adjoining portion of Arizona. LIST OF SPECIMENS. GARNET, variety ALMANDITE. BOHEMIA. Cabochon, irregular elliptical girdle; violet-red; carats; 25 by 13 by 6 mm. Isaac Lea collection No. 969 Cabochon, elliptical girdle; violet-red; carats; 24 by 13 by 7 mm. Isaac Lea collection No. 968 ' Economic Geology, vol. 11, 1916, p. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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