[en] Moessbauer spectra of ⁵⁷Co doped into CaF₂ single crystals are decomposed into a single line and a quadrupole doublet. The former is ascribed to Fe²⁺ ions on Ca²⁺ sites with cubic symmetry, and the latter to Fe²⁺ ions on axially symmetric interstitial sites associated with an adjacent cation vacancy. γ-irradiation further produces a new line which arises from Fe²⁺ ions on interstitial sites with cubic symmetry. When the irradiated crystals are quenched from 500⁰C, only two lines appear which arise from Fe²⁺ ions on interstitial sites associated with two neighbouring cation vacancies. (author)