Abstract: As representatives of petrochemically-evolved igneous rocks on the Moon, the granitic felsite clasts in lunar breccias have come under renewed focus as part of new efforts to use feldspars for assessing the inventory of lunar water and other volatiles. Previous petrologic studies of these clasts were tilted towards finding those assemblages and relationships most likely to be direct products of magmatic processes. In support of our on-going NanoSIMS (Nanoscale Secondary Ion Mass Spectrometry)…