Geikielite, the magnesium-analog of ilmenite, has been found in situ in some highly metamorphosed magnesian-marbles in the Santa Lucia Mountains, Monterey County, California, and this is the fourth in situ occurrence of geikielite thus far described. Dick (1893) identified bluish-to brownish-black pebbles in the gem sands of Ceylon as geikielite, which he believed was a magnesium analog of perovskite. Crook and Jones (1906) also described geikielite from a collection of Ceylon gem sands during a general study of such materials.

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