. Bulletin - United States National Museum. Science. THE MINERALS OF IDAHO 149 Penfield's Apparently the mineral has been abundant in the ores of several of the mines, the ore of the Henrietta mine con- taining more miargyrite than pyrargyrite and proustite. In color the mineral is steel black with metallic luster and it gives a red streak. An analysis or a crystallographic examination is necessary to dis- tinguish it from pyrargyrite. In the Henrietta ores it occurred as crusts of crystals on quartz often coated by white clay. The crystals commonly average less than 3mm. in diameter
. Bulletin - United States National Museum. Science. THE MINERALS OF IDAHO 149 Penfield's Apparently the mineral has been abundant in the ores of several of the mines, the ore of the Henrietta mine con- taining more miargyrite than pyrargyrite and proustite. In color the mineral is steel black with metallic luster and it gives a red streak. An analysis or a crystallographic examination is necessary to dis- tinguish it from pyrargyrite. In the Henrietta ores it occurred as crusts of crystals on quartz often coated by white clay. The crystals commonly average less than 3mm. in diameter and are usually not well adapted for crystallographic measurement, since the majority of them are either dull, appearing as though they had been slightly corroded, or are striated. The habits are as shown in Figures 23 and 24 and the forms observed, which are the common and characteristic ones for the species, are as follows: a(100) m(lOl) £(111) d(Sll) c(001) o(T01) s(211) £(124) The basal plane c is generally striated parallel with its intersection with the orthodome o. The pyramids d and s occur in oscillatory. 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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