The volcano-sedimentary rock association at Kittilä is characterized in many places by the presence of green-colored fuchsite-bearing ferroan dolomite-quartz rocks, locally called chromian marbles. The rock is cut by coarse-grained quartz-breunnerite veins. The surrounding country rock is a carbonate rock in which fuchsite has been replaced by chlorite or sericite. As the amount of the carbonates decreases, the rock grades into a quartz-sericite rock and eventually into a chlorite schist. These carbonate rocks have originated as chert-carbonate sediments.
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