||4.5 x 3.2 x 2.3
|Fayalite (mol%): 99;Ferrosilite (mol%): 26-80
|Exterior is 55% covered with a fusion crust that is rough in some areas and shiny in others. It is a brown-gray-green color with some iridescent weathering halos. The exposed interior is a dark gray-black matrix with light brown, light gray and white inclusions that range in size up to 2 mm. Fresh interior is very similar to the exposed areas but the matrix is a slightly lighter shade of gray.
|These sections are similar enough that one description will suffice. These sections consist of a highly brecciated assemblage of mostly single mineral grains ranging up to 0.5 mm in size. Grains are dominated by pyroxene and plagioclase with rare large olivine fragments. Polymineralic igneous fragments/clasts include coarse grained gabbro and symplectites. Melt veins and pockets were observed in all sections. DOM 18262 contains a fine grained apparently anorthositic fragment (~2 mm in max dimension) and a few melt droplets (approx. 100 microns in diameter) were observed. Olivines are fayalitic (Fa90-99), although two grains of Fa56 and Fa71 were analyzed. Pyroxene is dominantly pigeonite with fine exsolution, with orthopyroxene of Fs27Wo3 and augite Fs50Wo40. Rare high-FeO pigeonite (up to Fs80) is observed associated with the symplectite. Fe/Mn of pyroxenes ranges from ~50-70. Plagioclase is calcic with An90-97Or0.1-0.7. These meteorites are lunar basaltic breccias, likely regolith breccias.