. Bulletin - United States National Museum. Science. vLU' 100 101 102 Figs. 97-102.—Ilvaite crystals from Oolconda mine, South Mountain mine, Owyhee County deeply striated and rounded, apparently by oscillation between the prisms m(110) and s(120). They greatly resemble black tourmaline and upon casual examination might be mistaken for that mineral. The forms present on one of the best of these crystals were identi- fied as: a(100), &(010), m(110), fc(210), s(120), and <Z(140). The measurements obtained on one of the crystals occurring em- bedded in quartz are compared with the angles g
. Bulletin - United States National Museum. Science. vLU' 100 101 102 Figs. 97-102.—Ilvaite crystals from Oolconda mine, South Mountain mine, Owyhee County deeply striated and rounded, apparently by oscillation between the prisms m(110) and s(120). They greatly resemble black tourmaline and upon casual examination might be mistaken for that mineral. The forms present on one of the best of these crystals were identi- fied as: a(100), &(010), m(110), fc(210), s(120), and <Z(140). The measurements obtained on one of the crystals occurring em- bedded in quartz are compared with the angles given by Dana for the species as follows: Observed Average Calcu- lated, Dana (1) o / 66 38 37 28 72 42 (2) 67 46 38 00 73 10 67 12 37 44 72 56 67 22 h:h"' .... 36 52 73 45. 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
