. Additional notes on the Grinnell ice-cap. Ice -- Nunavut Baffin Island. 124 Field Museum of Natural History—Geology, Vol. VII impractical. The color of the mineral, the presence of chromium in one of the analyses, and the fact that the meteorite is an ataxite, lend support to the possibility of its being daubreelite. A most interesting feature of the meteorite is the presence of Neumann lines (figs. 50, 51). With the exception of Forsyth County,. Fig. 52. Spindle- and wedge-shaped rhabdites (different areas from fig. 48, C). Both areas contain one set of Neumann lines (see fig. 50) that are
. Additional notes on the Grinnell ice-cap. Ice -- Nunavut Baffin Island. 124 Field Museum of Natural History—Geology, Vol. VII impractical. The color of the mineral, the presence of chromium in one of the analyses, and the fact that the meteorite is an ataxite, lend support to the possibility of its being daubreelite. A most interesting feature of the meteorite is the presence of Neumann lines (figs. 50, 51). With the exception of Forsyth County,. Fig. 52. Spindle- and wedge-shaped rhabdites (different areas from fig. 48, C). Both areas contain one set of Neumann lines (see fig. 50) that are not visible here. Left, treated with neutral sodium picrate, 5 minutes. Right, nital, 30 seconds. Print over-exposed to bring out schreibersite particles. X180. no other nickel-poor ataxite showing Neumann lines has, hitherto, been reported. Here again, as in the case of the two phosphide bodies, an abrupt change in the structure of the Neumann lines is manifest. In the areas (fig. 48, A, B, C) bounded by the schreibersite veins the Neumann lines consist of a single set. The lines are parallel and straight, but not always continuous, nor of uniform width, nor evenly spaced. In the remaining portion of the section (fig. 48, D), occupied only by the shapeless or irregularly rounded phosphide bodies, at least in the greater part of it, the Neumann lines consist of two sets of parallel lines—running diagonals of a cubic face. The lines in this area are also not of uniform width, nor are they evenly spaced. It has been stated before that the meteorite has suffered cosmic reheating. On the basis of past laboratory experiments on the reaction of Neumann lines to heat, it can be assumed with reasonable. 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 Roy, Sharat Kumar, 1897-1962. Chicago : Field Museum of Natura
Size: 2025px × 1234px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: .
