400 Lunar Impact Melt Breccia
DaG 400 is a feldspathic,
therefore highland, breccia. About half its volume is impact
breccia clasts. Veins cutting through the sample are carbonates
from terrestrial weathering. This section is about 22 mm long
shown first in plane polarized transmitted light then in cross
400 has a variety of textures. Fields of view are 1.4 mm
has a glassy rim on the left and top (with a glassy
spherule?). Glass is isotropic so it is
transparent in plane polarized
transmitted light and black in cross polarized transmitted light. It appears dark, here, in reflected
light. Each frame is 1.5 mm square.
metal is almost certainly of meteoritic origin. Reflected
light. Field of view is 1.4 mm wide.