mineral
Magnetite or Hematite Nodule
Iron Oxide (Fe3O4 or Fe2O3)
Hardness: 5.5-6.5; Color: Dark grey to black; Luster: Metallic to sub-metallic; Crystal Structure: Isometric/Opaque; Specific Gravity: Approx 5.1
- Hardness
- 5
- Color
- Dark grey to black
- Luster
- Metallic to sub-metallic
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Physical properties
Hardness: 5.5-6.5; Color: Dark grey to black; Luster: Metallic to sub-metallic; Crystal Structure: Isometric/Opaque; Specific Gravity: Approx 5.1
Formation & geological history
Formed in hydrothermal veins, metamorphic rocks, and as an accessory mineral in igneous rocks; often found as nodules in sedimentary environments through precipitation.
Uses & applications
Major ore of iron for steel production; used in magnets, pigments, and heavy media separation.
Geological facts
Magnetite is the most magnetic mineral on Earth. When it exhibits natural magnetism, it is called a lodestone. It was used in early compasses by sailors.
Field identification & locations
Identify by its high density (feels heavy for its size), black/grey streak, and see if it attracts a magnet. Found worldwide, especially in banded iron formations.
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