Magnetite

Physical Properties

Hardness: 5.5-6.5 on Mohs scale. Color: Iron-black to dark grey. Luster: Metallic to submetallic. Crystal system: Isometric. Cleavage: None (octahedral parting). Specific Gravity: 5.1-5.2. Strongly magnetic.

Formation & Geological History

Formed in igneous, metamorphic, and sedimentary environments. Commonly occurs as an accessory mineral in igneous rocks like basalt and gabbro, and in hydrothermal veins.

Uses & Applications

Primary ore of iron. Used in the production of steel, as a heavy media for coal washing, in magnetic storage media, and as a mineral specimen for collectors.

Geological Facts

Magnetite is the most magnetic of all the naturally-occurring minerals on Earth. Naturally magnetized pieces called lodestones were used as the first magnetic compasses in history.

Field Identification & Locations

Identified in the field by its black color, black streak, and strong attraction to magnets. Found globally, with major deposits in Sweden, South Africa, and the USA.

Identified on: 5/10/2026

Mode: Standard