Important Uses of Magnetite
Magnetite, a common oxide mineral, is also an important ore of iron found in sedimentary, igneous and metamorphic rocks. Easy to identify, magnetite is an opaque, black metallic to sub-metallic mineral with the most magnetic properties of all natural metals. Magnetite is sometimes auto-magnetized and attracts metal objects.
Uses and Interests
Most importantly magnetite is mined as an ore of iron, according to The Mineral and Gemstone Kingdom. The iron is then used to make steel; this is the ore's main use. Magnetite is also used as a micronutrient in fertilizers, an aggregate in high-density concrete, a toner in electro-photography and as a pigment in paint. Mineral collectors favor magnetite for its crystals, and scientists take an interest in magnetite for its magnetic properties. Water jet cutting uses finely ground magnetite as an abrasive.
A naturally occurring mixture of magnetite and corundum produces an abrasive known as emery, according to the Geology.com website. Synthetic emery is produced by mixing aluminum oxides with magnetite, which allows for more control over particle size. Liquids used as heavy media for specific gravity separations are sometimes composed of powdered magnetite mixed with water. A suspension of magnetite is used to separate clean coal particles from those contaminated with pyrite, a sulfur mineral.
Alternative medicine practitioners value magnetite for its healing qualities, according to Gemstones Magic Healing. A bracelet of magnetite is said to work for migraines; anklets for knee joint, heel spurs or foot problems and necklaces for neck, back or shoulder pain. Magnetite is also said to act as an amplifier for other medicinal stones. As a safety precaution, magnetite should not be worn by persons with a pacemaker.