taconite

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a proprietary software tool for developing Ajax-enabled Internet applications
a low-grade flint-like iron ore containing 20-30% iron
A variety of chert containing magnetite and hematite, mined as an iron ore
Low-grade iron formation (e.g., in Minnesota). Recovery of the iron requires fine grinding and concentration of iron-bearing phases (see mineral processing), which are then formed into pellets suitable for blast furnaces. As high-grade deposits of iron ore have become depleted, taconite deposits have increased in importance
{i} low-grade iron ore
a variety of chert containing magnetite and hematite; mined as a low-grade iron ore