. Bulletin - United States National Museum. Science. THE MINERALS OF IDAHO 413 could accurately be described as a greenish tinge, the associated green grains being usually augite, titanite, or olivine. A few green and a few perfectly colorless transparent monazite crystals were seen in the columbite-samarskite concentrate from Idaho City described above. The monazite is, for the most part, in sharp and perfect crystals, although many of the larger crystals are broken or abraded. The average diameter of the monazite in the screened sands is less than 1 mm. but in one "oversize" sample
. Bulletin - United States National Museum. Science. THE MINERALS OF IDAHO 413 could accurately be described as a greenish tinge, the associated green grains being usually augite, titanite, or olivine. A few green and a few perfectly colorless transparent monazite crystals were seen in the columbite-samarskite concentrate from Idaho City described above. The monazite is, for the most part, in sharp and perfect crystals, although many of the larger crystals are broken or abraded. The average diameter of the monazite in the screened sands is less than 1 mm. but in one "oversize" sample from Center- ville rough crystals up to 5 mm. in diameter were observed, and larger masses may have been discarded by screening. In form the monazite from all of the localities represented is very similar. The five figures were all drawn from measurements made upon crystals selected from a sand from Centerville and subsequent examination of numerous other sands did not reveal any additional forms, combinations, or. 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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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
