Magnetic iron ore, being a black iron oxide containing 72.4% iron when pure.

A black, cubic, strongly magnetic, opaque mineral, Fe3O4.

Opaque black magnetic mineral composed of iron and oxygen. It is one of the principal ores of iron.

is a black to brownish metallic stone with magnetic properties. The legendary lodestone is one of the magnetites. The magnetites are formed of octahedral crystals of mineral whose chemical structure contains the unit, XFe204 . X may be Fe, Mg, Ni, Zn, or Mn. The first is most common; the last two are only weakly magnetic.

Iron ore fully oxidised (Fe304) and naturally magnetic.

A common Iron-containing mineral with ferromagnetic properties.

An oxide of iron (Fe3O4). Can be formed when clays rich in iron are fired in reduction (q.v.); for example, the black slips of ancient Greek pottery (box, p.89).

an oxide of iron that is strongly attracted by magnets

an oxide mineral with the chemical formula of Fe3O4

A magnetic material (an iron oxide) found in small particles in some biological material

An igneous oxide of iron, with a specific gravity of 5.2 and having an iron content of 65 to 70 percent or more. 99.9% of all magnetite deposits contain no gold locked in their crystalline structure. The gold may be free or locked as a limonite coating. Limonite crystals (hydrous ferric oxide/ oxidized sulfides) occurs with the magnetite and sometimes may contain gold. (black/brown in color and non magnetic) (sometimes mistaken for magnetite).

Natural magnetic iron oxide, Fe3O4.

Fe. An oxide of iron that forms under relatively oxidizing chemical conditions. See also ilmenite.

a black, strongly magnetic mineral of the spinel group.

Iron oxide mineral (Fe3O4). Usually tiny black, metallic crystals. Magnetite will attract a magnet and sometimes, in a rock, a hiker's compass needle.

Magnetite - Iron sesquioxide, FeO.Fe2O3, magnetic iron ore.

iron oxide; Mineral, Fe3O4; Color: black; SG: 5.2; Hardness: 5.5 - 6.5; Comments: ore of iron, strongly magnetic

Iron oxide ( Fe3O4). A protective coating the forms on iron pipe to prevent further rapid corrosion. Usually black or maroon in color. Can be very destructive to mechanical seal components until the oxide stabalizes. We often find these iron pipes in new hot water systems

A black, magnetic, iron oxide mineral, and an important source of iron.

an ore mineral of iron which is an iron oxide. It is black in color, has a submetallic luster, and is strongly attracted to a magnet.

Naturally occurring magnetic oxide of iron (Fe3O4).

A black, magnetic iron mineral with the chemical formula (Fe,Mg)Fe2O4.

A magnetic form of iron ore also known as lodestone. (See Black Sand).

An aggregate used in heavy weight concrete, consisting primarily of ferrous metaferrite (Fe304). A black magnetic iron ore with a specific gravity of approximately 5.2 and a Mohs hardness of about 6.

the magnetic ore mineral of iron, black in color (iron3oxygen4)

Fe304 The heavy magnetic black sands (iron) that is found in the heavy concentrates that collect in the recovery system.

(1851) Magnetite is a black oxide of iron in the spinel group and is also known in the gemstone trade as lodestone. The colour range includes iron black and pale brown and the stone is strongly magnetic. It is found both in dark octahedral crystals and in amorphous lumps and can be attracted by a magnet from surrounding rubble.

(Fe3O4) A black magnetic oxide of iron that is extremely dense and used as a coagulant and filter medium in water treatment.

The oxide or iron of intermediate valence which has a composition close to the stoichiometric composition Fe3O4.

an important iron ore that is strongly attracted by a magnet. Magnetite that possesses polarity is called lodestone. [AHDOS

Magnetite is a black to gray opaque magnetic mineral composed of iron and oxygen (it is magnetic iron ore). Magnetite is found worldwide. Magnetite, Fe3+2Fe2+O4, has a hardness of 5.5-6 and a specific gravity of 5.1 - 5.2. The streak is black.

Magnetite is a ferrimagnetic mineral with chemical formula Fe3O4, one of several iron oxides and a member of the spinel group. The chemical IUPAC name is iron(II,III) oxide and the common chemical name ferrous-ferric oxide.