Answers are grounded in this paper and cite their sources.
Glass spherules show multiple high-velocity impact craters and are coated with small particles including glass, plagioclase, clinopyroxene, ilmenite, olivine, chromite, rock fragments, and frozen droplets of iron, nickel-iron, and troilite. These spherules passed through an impact cloud of hot fragmental material, condensing iron-rich vapor and high-velocity projectiles. Breccia contains concentric, accretionary lapilli units and appears to be a sintered deposit from a hot lunar base surge generated by impact.
No takes yet. Share an insight, caveat, or question.
McKay et al. (1970) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: