THIS PROPOSAL PRESENTS 6 PRIMARY SCIENCE TASKS: 1-4) EXPERIMENTAL STUDIES INTO THE PARTITIONING BEHAVIOR OF F CL AND OH BETWEEN APATITE AND PLANETARY MELT COMPOSITIONS (QUE 94201 YAMATO 980459 AND A LUNAR GRANITE) OVER A RANGE OF RELEVANT PRESSURE AND TEMPERATURE CONDITIONS (RUN PRODUCTS WILL BE ANALYZED BY EPMA AND MULTIPLE SIMS TECHNIQUES). 5) AN IN DEPTH STUDY OF BULK COMPOSITIONS AND ISOTOPIC COMPOSITIONS OF PHOSPHATES FROM THE NEW MARTIAN METEORITE BASALTIC BRECCIA NWA 7034. THIS TASK WILLBE COMPLETED THROUGH A COMBINATION OF TEXTURAL AND MICRO-BEAM ANALYSES (EPMA AND MULTIPLE SIMS TECHNIQUES). 6) A COMBINED TEXTURAL AND MICRO-BEAM ANALYTICAL SURVEY (EPMA AND MULTIPLE SIMS TECHNIQUES) OF APATITE COMPOSITIONS FROM ACHONDRITE METEORITES TO INCLUDE BRACHINITES ANGRITES AND UREILITES.