mineral
Hematite Nodule
Hematite (Alpha Fe2O3)
Hardness: 5.5-6.5; Color: Dark grey to reddish-brown; Luster: Metallic to earthy; Structure: Trigonal/Hexagonal; Cleavage: None; Specific Gravity: 5.26.
- Hardness
- 5
- Color
- Dark grey to reddish-brown
- Luster
- Metallic to earthy
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Physical properties
Hardness: 5.5-6.5; Color: Dark grey to reddish-brown; Luster: Metallic to earthy; Structure: Trigonal/Hexagonal; Cleavage: None; Specific Gravity: 5.26.
Formation & geological history
Formed as a primary mineral or as an alteration product in hydrothermal veins, sedimentary iron formations, or through the weathering of iron-rich minerals. Often found in BIF (Banded Iron Formations).
Uses & applications
Main ore of iron; also used in jewelry as beads, pigments for coloring, and industrial radiation shielding.
Geological facts
Hematite’s name is derived from the Greek word for 'blood' because it produces a dark red streak when powdered or scratched.
Field identification & locations
Identified by its high density and characteristic rust-red streak on a porcelain plate. Common in areas with ancient water activity or iron-rich sedimentary basins.
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Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock