Magnetite, fe304, black iron oxide, 1309-38-2, black iron sand


Reade Advanced Materials offers:

Magnetite / Black Iron Oxide Powder



a) Magnetite is a natural iron oxide magnet, hence the name, giving it a very nice distinguishing characteristic. Magnetite is the most magnetic of all the minerals on Earth.

b) Magnetite is a member of the spinel group which has the standard formula A(B)2O4. The A and B represent different metal ions that occupy specific sites in the crystal structure. In the case of magnetite, Fe3O4, the A metal is Fe +2 and the B metal is Fe +3; two different metal ions in two specific sites. This arrangement causes a transfer of electrons between the different irons in a structured path or vector. This electric vector generates a magnetic field.

c) Lustrous black, magnetic mineral, Fe3O4. It occurs in crystals of the cubic system, in masses, and as a loose sand. It is one of the important ores of iron (magnetic iron ore) and is a common constituent of igneous and metamorphic rocks. It is found in various parts of the United States, Norway, Sweden, and the Urals. A variety of magnetite, lodestone (or loadstone) exhibits polarity and is especially interesting for its natural magnetism; Magnet Cove, Ark., became famous as a source. 

d) Magnetite is sometimes found in large quantities in beach sand. Such mineral sands or iron sands or black sands are found in various places such as California and the west coast of New Zealand. The magnetite is carried to the beach via rivers from erosion and is concentrated via wave action and currents.

a) Purity Available: 96% to  99.9%

b) A food grade magnetite is readily available from READE

c) A Superparamagnetic iron oxide is available (10 microns in size)-- no magnetic memory

a) Lumps, pieces, targets, granules and various powder granulations down to 0.020 microns

b) Standard low micron APS (d50) granulations are typically available at 10 microns, 18 microns and 63 microns

c) Black iron oxide nanoparticles are presently commercially available as small as 20 nanometers

d) Custom granulations are available at premium pricing

Luster Metallic
Tenacity Brittle
ID Mark Ferromagnetic
Solid Density (gm/cm3) 5.1
Streak Black
pH 7
Transparency Opaque
Mohs Hardness @20°C 5.5 to 6.5
Fracture Conchoidal 
Specific Gravity 5.17 to 5.18
Color Black to grayish
Crystal System Isometric
Mohs Hardness 5.5 to 6.0
Particle Shape Irregular
Magnetic Properties Ferri magnetic

Magnetite, fe304, black iron oxide, 1309-38-2, black iron sand, Magnetite, fe304, black iron oxide, 1309-38-2, black iron sand

a) Magnetite is an important ore of iron. Its perfect crystals are also famous among mineral collectors. This mineral is of scientific interest because of its special magnetic properties.

b) Magnetite is used as a pigment for magnetic applications, polishing compounds, cosmetics, medicines, polymer & rubber filler, building & construction, appliances, and magnetic inks.

50 lbs. bags, poly-lined fiber drums, bulk bags and loose bulk

a) Magnetite components are listed on the TSCA inventory.

b) A food grade magnetite powder is readily available from READE in commercial quantities.

c) For further information please call the E.P.A. at +1.202-554-1404



Contact READE


Telephone Contact Numbers:
East Coast USA: +1-401-433-7000 /  West Coast USA: +1-775-352-1000 / Latin América: +507-314-1282

© 2006  Reade Advanced Materials, All Rights Reserved.
Legal Disclosure
To report problems with this site, send your e-mail to:

This page was last updated on 31 January 2006