. Bulletin - United States National Museum. Science. Fig. 157 —Leadhillite. Lookout Mountain mine, Pine Creek, Shoshone County lowing ar gles: Measurements of Leadhillite, Lookout mine Form Symbol Quality, description Measured Calculated No. Letter Gdt. Miller <p P <p P 1 ? c a m w. (?) (?) x s 0 ooO oo2 10 03 12 m 001 100 120 101 031 (?) 065 (?) 121 212 Dull, poor Fair 90 66 29 48 90 00 7 11 6 00 29 48 66 12 0 / 0 00 90 00 90 00 52 13 74 24 53 20 68 40 53 30 90 66 29 47 90 00 0 / 0 12 90 00 3 Good - 90 00 4 52 13 5 0 00 I 75 16 6 0 00 i 53 04 7 Good 29 51 j 68 37 8 66 27 54 12 The measu
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. Bulletin - United States National Museum. Science. Fig. 157 —Leadhillite. Lookout Mountain mine, Pine Creek, Shoshone County lowing ar gles: Measurements of Leadhillite, Lookout mine Form Symbol Quality, description Measured Calculated No. Letter Gdt. Miller <p P <p P 1 ? c a m w. (?) (?) x s 0 ooO oo2 10 03 12 m 001 100 120 101 031 (?) 065 (?) 121 212 Dull, poor Fair 90 66 29 48 90 00 7 11 6 00 29 48 66 12 0 / 0 00 90 00 90 00 52 13 74 24 53 20 68 40 53 30 90 66 29 47 90 00 0 / 0 12 90 00 3 Good - 90 00 4 52 13 5 0 00 I 75 16 6 0 00 i 53 04 7 Good 29 51 j 68 37 8 66 27 54 12 The measured crystal was examined under the microscope and found to be biaxial negative with 2E very small, birefringence high. The axial plane is parallel to the face adopted as a(100) and the acute bisectrix perpendicular to (001) which makes the optical orientation Y = a, Z = &, X = c. Dispersion r<v inclined marked.. 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 work.. 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.