Newsletter |
42,2 |
Location |
Dominion Range |
Field Number |
24538 |
Dimensions (cm) |
2.5 x 2.5 x 2.0 |
Weight (g) |
13.59 |
Original Classification |
Lunar-Basaltic Breccia |
Pairing |
DOM 18242;
DOM 18244;
DOM 18262;
DOM 18509;
DOM 18543;
DOM 18545;
DOM 18666;
DOM 18678;
|
Fayalite (mol%): 93;Ferrosilite (mol%): 22-77 |
A |
A |
One side is covered with shiny varnish (possibly fusion crust) that is dark gray brown. The other side is domed and exhibits a rough texture of radiating flow lines that is a dark gray-green color. Fresh interior is a dark gray-black matrix with light brown, light gray and white inclusions that range in size up to 2 mm. There is a vein of dark gray-brown shiny material (possibly glass) running through the entire sample on one end. |
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. |