mineral

Magnetite-rich Iron Ore

Magnetite (Fe3O4)

Hardness: 5.5-6.5; Color: Iron-black to brownish-black; Luster: Metallic to submetallic; Crystal structure: Isometric (octahedral); Cleavage: None (distinct parting in some specimens); Specific Gravity: 5.1-5.2

Hardness: 5
Color: Iron-black to brownish-black
Luster: Metallic to submetallic

Identified June 1, 2026More mineral →

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Physical properties

Formation & geological history

Formed in igneous or metamorphic environments through crystallization from magma or hydrothermal replacement. It is often found in banded iron formations (BIFs) and contact metamorphic deposits.

Uses & applications

Primary ore of iron used in the production of steel; also used in heavy media separation, as a pigment, and in magnetic recording media.

Geological facts

Magnetite is the most magnetic of all the naturally occurring minerals on Earth. Naturally magnetized pieces are known as lodestones and were used as the first magnetic compasses.

Field identification & locations

Identify in the field by its strong magnetic attraction, black streak, and high density. Commonly found in Kiruna (Sweden), Pilbara (Australia), and the Lake Superior region (USA).