Stoichiometry of Fluorite Corner Atoms (8*1/8=1)、 Face Atoms (6*112=3) Ta Holes (8*1=8) 4 Lattice Cations:8 Tetrahedral Anions 1:2 Stoichiometry (CaF2,SrCl2,HgF2) XIll-4Stoichiometry of Fluorite 4 Lattice Cations: 8 Tetrahedral Anions 1:2 Stoichiometry (CaF2, SrCl2, HgF2) Corner Atoms (8 * 1/8 = 1) Face Atoms (6 * 1/2 = 3) Td Holes (8 * 1 = 8) XIII-4