The concentrations and distribution of trace amounts of metal impurities in CaF2 crystals grown by the Stockbarger method from CaF2 powder and 14 kinds of metal-oxide additives were examined and compared with CaF2 crystals grown from CaF2 powder and metal-fluoride additives. In the CaF2 crystals grown with metal-oxide additives, the Li, Na, Cr, Fe, Ni, Cu and Pb metal-impurities were hardly detected, but the Mg, Sr, Ba and Al metal impurities remarkably remained. This tendency is almost the same as that observed in metal-fluoride addition. In the CaF2 crystals grown with metal-oxide additives, however, large amounts of La, Y and Cc metal-impurities remained, compared with the CaF2 crystals grown with metal-fluoride additives. In the CaF2 crystals grown with metal-oxide additives, moreover, the significant segregation behaviors of the Mg, Sr, Ba, La and Ce metal-impurities occurred in the top part of the CaF2 crystals. (C) 2002 Elsevier Science B.V. All rights reserved.