Sample Petrographic Description
Sample Number | DOM 18506 |
Newsletter | 47,1 |
Location | Dominion Range |
Field Number | 24589 |
Dimensions (cm) | 2.0 x 2.5 x 1.5 |
Weight (g) | 9.65 |
Original Classification | H5 Chondrite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 18;Ferrosilite (mol%): 16 | |
Weathering | |
B | |
Fracturing | |
A | |
Macroscopic Description - Leslie Young | |
The exterior has 85% fusion crust with an iridescent sheen. The exposed areas are light grey in color, with minor oxidation. There is minimal pitting across the surface. The interior has a dark grey matrix with small, less than 1 mm white inclusions. There are large, deep red areas visible on cut surface. | |
Thin Section Description (,2) - Cari Corrigan, Tim McCoy | |
This meteorite is an unremarkable H5 chondrite (Fa18Fs16) other than the existence of a melt vein that nearly crosscuts the section, is ~4 mm in length by 0.5 mm in width, contains vesicles up to 100 microns, and has intergrown quenched metal-sulfide melts. This vein is remarkable in that while its margins and portions of the interior are microcrystalline, much of the center of the vein appears glassy, lacking microcrystallites, a feature rarely observed by us in ordinary chondrites. One end of the vein is truncated by fusion crust that covers a significant portion of the stone. The other end may trace to the fusion crust, but largely pinches out between mafic silicates. No high-pressure polymorphs (e.g. ringwoodite) were observed optically. |
Antarctic Meteorite Images for Sample DOM 18506 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample DOM 18506 | ||||
Thin Section Photo(s) : | ||||