Haematite
Haematite, is the mineral form o airn(III) oxide (Fe2O3), ane o several airn oxides.
| Haematite | |
|---|---|
 Brazilian trigonal haematite crystal | |
| General | |
| Category | Oxide minerals |
| Formula (repeatin unit) | airn(III) oxide, Fe2O3, α-Fe2O3 |
| Strunz clessification | 04.CB.05 |
| Creestal seestem | Trigonal |
| Space group | Trigonal hexagonal scalenohedral H-M symbol: (32/m) Space group: R3c |
| Unit cell | a = 5.038(2) Å, c = 13.772(12) Å; Z = 6 |
| Identification | |
| Colour | Metallic gray, dull tae bricht reid |
| Creestal habit | Tabular tae thick crystals; micaceous or platy, commonly in rosettes; radiatin fibrous, reniform, botryoidal or stalactitic masses, columnar; yirdy, granular, oolitic |
| Twinnin | Penetration an lamellar |
| Cleavage | None, mey shaw pairtins on {0001} an {1011} |
| Fractur | Uneven tae sub-conchoidal |
| Tenacity | Brickle |
| Mohs scale haurdness | 5.5–6.5 |
| Skinkle | Metallic tae splendent |
| Streak | Bricht reid tae mirk reid |
| Diaphaneity | Opaque |
| Speceefic gravity | 5.26 |
| Optical properties | Uniaxial (-) |
| Refractive index | nω = 3.150–3.220, nε = 2.870–2.940 |
| Birefringence | δ = 0.280 |
| Pleochroism | O = brounish reid; E = yellaeish reid |
| References | |
References
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