mineral

Magnetite (Lodestone variant potential)

Magnetite (Fe3O4)

AI-generated identification · may be incorrect

Hardness: 5.5-6.5 Mohs. Color: Black to brownish-black. Luster: Metallic to submetallic. Crystal structure: Isometric/Octahedral. Specific gravity: 5.17-5.18. It is highly magnetic.

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

Identified July 8, 2026More mineral →

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Physical properties

Hardness: 5.5-6.5 Mohs. Color: Black to brownish-black. Luster: Metallic to submetallic. Crystal structure: Isometric/Octahedral. Specific gravity: 5.17-5.18. It is highly magnetic.

Formation & geological history

Commonly forms as an accessory mineral in igneous and metamorphic rocks, as well as in banded iron formations through sedimentary processes. Can be found in beach sands as heavy mineral deposits.

Uses & applications

The primary ore of iron. Used in industrial manufacturing, heavy media separation, and as a magnetic pigment. Historically used in early compasses (as lodestone).

Geological facts

Magnetite is the most magnetic of all the naturally occurring minerals on Earth. Naturally magnetized pieces called lodestones were used by ancient mariners to navigate at sea.

Field identification & locations

Identify in the field using a handheld magnet; it will strongly attract. It also leaves a black streak. Common in basalt, gabbro, and granite. Collectors look for well-formed octahedral crystals.