Geikielite is a magnesium titanium oxide mineral with formula: MgTiO3.

It was first described in 1892[5] for an occurrence in the Ceylonese gem bearing gravel placers.

It was named for Scottish geologist Sir Archibald Geikie (1835–1924).

[4] It occurs in metamorphosed impure magnesian limestones, in serpentinite derived from ultramafic rocks, in kimberlites and carbonatites.

Associated minerals include rutile, spinel, clinohumite, perovskite, diopside, serpentine, forsterite, brucite, hydrotalcite, chlorite and calcite.