Shock lithification of regolith breccias is a ubiquitous process on the surfaces of airless planetarybodies and may induce thermal effects, including melting on regolith breccia minerals. However, potential thermal effects on lithic and mineral clasts in regolith breccias have seldom been quantitativelyconstrained. Here, we report two types of micro-textures of armalcolite [(Mg,Fe2+)Ti2O5] in an Mg-suitelithic clast from lunar regolith breccia meteorite Northwest Africa 8182. One type of armalcolite containsoriented fine-grained ilmenite grains; the other occurs as an aggregate of ilmenite, rutile, spinel, andloveringite. We propose that the two types of micro-textures formed through subsolidus breakdownof armalcolite by different processes. The formation of ilmenite inclusions in armalcolite is related toslow cooling after the solidification of its source rock, whereas the ilmenite-rutile-spinel-loveringiteaggregates probably formed during the shock lithification event of NWA 8182. The results indicatethat the temperature at the margin of lithic clasts could be raised up to at least 600 °C during strongshock lithification of lunar regolith and has profound thermal effects on the mineralogical and isotopicbehaviors of lithic and mineral fragments in lunar regolith breccias.