More anatase

"The occurrence of titanium minerals in soils is generally minor.
Estimations of amounts vary; the majority of soils worldwide contain < 1%
titanium. This is usually in the form of anatase, brookite, rutile,
ilmenite, or sphene. Quantities of up to 25% (TiO2) have been reported for
certain size fractions from Hawaiian soils (Sherman, 1952). Significant
quantities have also been reported in the A horizons of peaty Podzols from
Ireland and Scotland (Bain, 1976)."

http://www.iti.northwestern.edu/publications/tdr/1994_papers/titan.html

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