mineral
Hematite
Hematite, Iron(III) oxide (Fe2O3)
Hardness: 5.5-6.5 (Mohs scale); Color: Metallic gray to black; Luster: Metallic; Crystal Structure: Trigonal (hexagonal system); Cleavage: None; Specific Gravity: 5.26
- Hardness
- 5
- Color
- Metallic gray to black
- Luster
- Metallic
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Physical properties
Hardness: 5.5-6.5 (Mohs scale); Color: Metallic gray to black; Luster: Metallic; Crystal Structure: Trigonal (hexagonal system); Cleavage: None; Specific Gravity: 5.26
Formation & geological history
Formed in hydrothermal veins, as an alteration product in igneous rocks, or as a chemical precipitate in sedimentary environments like Banded Iron Formations (BIFs).
Uses & applications
Primary ore of iron for steel production, pigment (ochre), jewelry (cabochons and beads), and heavy media separation in mining.
Geological facts
Hematite always leaves a reddish-brown streak even if the stone looks black. The name comes from the Greek word 'haima' meaning blood. It was used by early humans for cave paintings.
Field identification & locations
Identified by its high density and distinctive red streak when rubbed on unglazed porcelain. Commonly found in large sedimentary deposits like those in the Lake Superior district of North America.
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Mineral/Rock
Banded Gneiss (River Rock/Pebble)
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Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
mineral
Epidote
Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)
mineral