mineral
Hematite (Ironstone) Nodule
Hematite (Fe2O3)
Hardness: 5.5-6.5 Mohs scale. Color: Reddish-brown to metallic grey. Luster: Sub-metallic to dull/earthy. Crystal structure: Trigonal. Specific gravity: 5.26.
- Hardness
- 5
- Color
- Reddish-brown to metallic grey
- Luster
- Sub-metallic to dull/earthy
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Physical properties
Hardness: 5.5-6.5 Mohs scale. Color: Reddish-brown to metallic grey. Luster: Sub-metallic to dull/earthy. Crystal structure: Trigonal. Specific gravity: 5.26.
Formation & geological history
Formed as a chemical precipitate in sedimentary environments or through the oxidation of iron-rich minerals. Common in Banded Iron Formations (BIFs) dating back over 2 billion years.
Uses & applications
Primary ore of iron for steel production. Pigments for paints and cosmetics. Polished for jewelry and decorative carvings.
Geological facts
The name hematite is derived from the Greek word for blood, 'haima', because of its red streak. It is also found in abundance on the surface of Mars, giving the planet its red color.
Field identification & locations
Identify by its heavy weight (high density) and by scratching it against unglazed porcelain; it should leave a distinct rust-red streak regardless of the specimen's external color.
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