. Bulletin - United States National Museum. Science. 128 BULLETIN 131, UNITED STATES NATIONAL MUSEUM A specimen from the dump of the Gold Hill mine consists of quartz porphyry containing abundantly disseminated pyritohedral crystals of pyrite. A large and completely sericitized phenocryst of feldspar in this rock carries groups of slightly larger pyrite crystals of dom-. 10 Figs. 9-10.—9, Pyrite. Highly modified crystal from Carroll-Driscoll mine, Boise County. 10, Pyrite. Dominantly cubic crystal from sericitized feldspar. Gold Hill mine, Boise County inantly cubic habit with the modifying fa
. Bulletin - United States National Museum. Science. 128 BULLETIN 131, UNITED STATES NATIONAL MUSEUM A specimen from the dump of the Gold Hill mine consists of quartz porphyry containing abundantly disseminated pyritohedral crystals of pyrite. A large and completely sericitized phenocryst of feldspar in this rock carries groups of slightly larger pyrite crystals of dom-. 10 Figs. 9-10.—9, Pyrite. Highly modified crystal from Carroll-Driscoll mine, Boise County. 10, Pyrite. Dominantly cubic crystal from sericitized feldspar. Gold Hill mine, Boise County inantly cubic habit with the modifying faces shown in Figure 10. The forms and angles measured on one of these crystals are given in the following table: Measurements of pyrite from Gold Hill mine Form Symbol Quality, description Measured Calculated No. Letter Miller Gdt. <p P V P 1 } P { 001 010 111 122 123 132 124 0 Ooo 1 ?\ ?l 51 o , 0 00 90 00 54 47 48 10 36 43 57 44 30 00 O 1 0 00 45 00 26 34 26 34 18 26 26 34 0 / 0 00 ? .do 0 00 45 02 26 32 26 32 18 26 26 32 90 00 3 54 44 4 48 11 1 :l{ do 36 42 6 57 41 7 29 12. 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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