mineral

Magnetite or Hematite-rich Ore

Magnetite (Fe3O4) or Hematite (Fe2O3)

AI-generated identification · may be incorrect

Hardness: 5.5-6.5 (Mohs scale); Color: Black to dark gray; Luster: Metallic to sub-metallic; Crystal Structure: Isometric; Cleavage: None/Indistinct; Specific Gravity: 4.9-5.2

Hardness: 5
Color: Black to dark gray
Luster: Metallic to sub-metallic

Identified May 28, 2026More mineral →

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Physical properties

Hardness: 5.5-6.5 (Mohs scale); Color: Black to dark gray; Luster: Metallic to sub-metallic; Crystal Structure: Isometric; Cleavage: None/Indistinct; Specific Gravity: 4.9-5.2

Formation & geological history

Commonly forms in igneous and metamorphic rocks via magmatic segregation or contact metamorphism. Often found in banded iron formations dating back billions of years.

Uses & applications

Primary ore of iron; used in heavy media separation, steel production, and as pigments. Sometimes used in jewelry as 'magnetic hematite' (though usually synthetic).

Geological facts

Magnetite is the most magnetic naturally occurring mineral on Earth. Ancient mariners used 'lodestones' (naturally magnetized magnetite) as the first primitive compasses.

Field identification & locations

Identify by its heavy weight (high density), dark streak (black for magnetite, reddish-brown for hematite), and its reaction to a magnet. Look for it in iron-rich geological regions.