LUNAR TROCTOLITE 76535 IS A PRISTINE SAMPLE OF THE LUNAR HIGHLANDS MG SUITE AND HAS BEEN A FOCUS OF INTENSE STUDY SINCE ITS RETURN FROM THE APOLLO 17 MISSION. THE PETROLOGY AND RADIOISOTOPE CHRONOMETRY OF MG SUITE MATERIALS SUGGEST A COMPLEX HISTORY INCLUDING CONVECTIVE MANTLE OVERTURN AND JUXTAPOSITION OF CUMULATES FROM THE LUNAR MAGMA OCEAN AGAINST THE BASE OF A PRIMORDIAL CRUST TO CREATE A HYBRIDIZED PARENT CAPABLE OF CRYSTALLIZING FORSTERITE AND ANORTHITE. KEY QUESTIONS REMAIN HOWEVER REGARDING THE TIMESCALES OF MAGMA COOLING CRYSTAL ACCUMULATION AND METASOMATISM RELATIVE TO THE FORMATION OF FERROAN ANORTHOSITE CRUST. THIS STUDY AIMS TO INVESTIGATE MAGMATIC AND SUBSOLIDUS INTRA-GRAIN CHEMICAL MASS TRANSFER BY EXPLOITING SUBTLE COMPOSITIONAL GRADIENTS AND MICROTEXTURES THAT ATTEST TO THE ARRESTED TRANSITION TO FULL CHEMICAL EQUILIBRATION DURING COOLING OF 76535.