The dimensions of the unit cell are: a=6.259 plus or minus 0.005, b=7.124 plus or minus 0.005, c=10.990 plus or minus 0.005 A for CaCrO4Cl, and a=6.185 plus or minus 0.002, b=6.983 plus or minus 0.002, c=10.816 plus or minus 0.004 A for CaPO4Cl. The crystal structures of ...