[Fe/H]–φ31–P relations are found for c‐type RR Lyrae stars in globular clusters. The relations are analogous to that found by Jurcsik & Kovács for field ab‐type RR Lyrae stars, where a longer period correlates with lower metallicity values for similar values of the Fourier coefficient φ31. The relations obtained here are used to determine the metallicity of field c‐type RR Lyrae stars, those within ω Cen, the Large Magellanic Cloud and toward the galactic bulge. The results are found to compare favourably to metallicity values obtained elsewhere.
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