. Bulletin - United States National Museum. Science. Fios. 128-130.—Monazite crystals from placer concentrates. Boise County tals of both monazite and zircon from angular granite soil formed by the disintegration of the granite on slopes where these minerals could have no other source. The nature of the mineral, monazite, its occurrence elsewhere throughout the world, and the fact that it is not invariably present in drainage basins in the granitic area probably indicate that it occurs, not in the normal granite, but in the small coarsened pegmatitic streaks and veins which are locally abundan
. Bulletin - United States National Museum. Science. Fios. 128-130.—Monazite crystals from placer concentrates. Boise County tals of both monazite and zircon from angular granite soil formed by the disintegration of the granite on slopes where these minerals could have no other source. The nature of the mineral, monazite, its occurrence elsewhere throughout the world, and the fact that it is not invariably present in drainage basins in the granitic area probably indicate that it occurs, not in the normal granite, but in the small coarsened pegmatitic streaks and veins which are locally abundant in the granitic mass. The description of the monazite from the localities in Boise County will suffice for that from all of the other places where this mineral has been found in the State since they present no essential differ- ences. In color it is commonly resinous golden-yellow to amber or orange brown. Only a few crystals were found which had what. 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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