108 ANALYTICAL METHODS/Mineral Analysis Table Analysis of garnet by EMPA/WDS for major elements and by LA ICP MS for trace elementsa Oxides (wt.%) Atoms (Oxygen ¼ 12) Trace (ppm) End member (%) SiO2 TiO2 Al2O3 Cr2O3 FeO MnO ZnO MgO CaO Na2O K2O 37.12 0.03 20.80