mineral

Magnetite / Hematite mix (Iron Ore)

Fe3O4 (Magnetite) / Fe2O3 (Hematite)

Hardness: 5.5-6.5; Color: Metallic black to steel grey; Luster: Metallic to sub-metallic; Crystal structure: Isometric (magnetite) or Trigonal (hematite); Cleavage: None; Specific Gravity: Approx. 5.2

Hardness: 5
Color: Metallic black to steel grey
Luster: Metallic to sub-metallic

Identified April 10, 2026More mineral →

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Physical properties

Formation & geological history

Formed in igneous, metamorphic, and sedimentary environments. Magnetite often forms as a primary mineral in igneous rocks or via hydrothermal replacement; Hematite often forms in banded iron formations (BIFs) through oxidation.

Uses & applications

Primary source of iron for steel manufacturing. Ground into pigments for paints and cosmetics. Magnetite is used in heavy media separation and industrial catalysts.

Geological facts

Magnetite is the most magnetic mineral on Earth. If it is naturally magnetized, it is called a Lodestone. It was the basis for the first compasses used in navigation.

Field identification & locations

Identify in the field by its high density (feels heavy for its size), black/grey metallic look, and magnetic attraction. Magnetite will leave a black streak; Hematite leaves a reddish-brown streak. Common in mining districts of Minnesota, Michigan, Sweden, and Brazil.

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

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Nephrite Jade

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Mineral/Rock

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Metamorphic Rock

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