Agglutinates are a common type of particle found in lunar regolith.
Agglutinates are small glassy breccias formed
when micrometeorites (< 1 mm in diameter)
strike the lunar regolith. During micrometeorite
impacts, some of the regolith melts and some does not, so the final product
is a glass with entrained mineral and rock fragments. The glass often shows
flow features and vesicles (gas bubbles). Impacts liberate solar-wind-implanted
hydrogen and helium in the regolith causing bubbles in the glass. Agglutinates
are typically tens of microns to a few millimeters in diameter.