. Bulletin - United States National Museum. Science. 2 3 Figs. , Argentite. Elongated dodecahedral crystal. 3, Argentite. Distorted crystal simulating orthorhombic symmetry ments of granite included in the veins (pi. 1) and the argentite layers are frequently surmounted by a comb of quartz crystals (pi. 4, lower). In the Poorman mine argentite was nowhere very abun- dant but it occurred occasionally as rich streaks of finely disseminated grains in quartz (Cat. No. 14799, U. S. N. M.). In the De Lamar mine this mineral was almost universally present in the silver ores as fine aggregates i
. Bulletin - United States National Museum. Science. 2 3 Figs. , Argentite. Elongated dodecahedral crystal. 3, Argentite. Distorted crystal simulating orthorhombic symmetry ments of granite included in the veins (pi. 1) and the argentite layers are frequently surmounted by a comb of quartz crystals (pi. 4, lower). In the Poorman mine argentite was nowhere very abun- dant but it occurred occasionally as rich streaks of finely disseminated grains in quartz (Cat. No. 14799, U. S. N. M.). In the De Lamar mine this mineral was almost universally present in the silver ores as fine aggregates in quartz or as thin sheets on the walls of narrow veins. It also occurred commonly as nodular or rounded masses inclosed in white clay and ranging in size from small shot to some which were as large as an In the War Eagle mine argentite? finely disseminated in minute grains, constituted rich black streaks in dense quartz containing cavities lined with valencianite crystals « J. B. Umpleby. U. S. Geol. Survey Bull. 528, p. 75, 1913. " Waldemar Lindgren. Gold and silver veins in Idaho. U. S. Geol. Survey, 20th Ann. Rept., pt. 3, p. 168, 1900. Some of these nodules of so-called argentite have since been found to be 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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