Properties
| Category | Oxide minerals |
|---|---|
| Formula | iron(III) oxide, Fe2O3, α-Fe2O3 |
| Crystal system | Trigonal |
| Color | Metallic grey, dull to bright "rust-red" in earthy, compact, fine-grained material, steel-grey to black in crystals and massively crystalline ores |
| Crystal habit | Tabular to thick crystals; micaceous or platy, commonly in rosettes; radiating fibrous, reniform, botryoidal or stalactitic masses, columnar; earthy, granular, oolitic |
| Cleavage | None, may show partings on {0001} and {1011} |
| Fracture | Uneven to subconchoidal |
| Tenacity | Brittle |
| Mohs scale hardness | 5.5–6.5 |
| Luster | Metallic to splendent |
| Streak | Bright red to dark red |
| Diaphaneity | Opaque |
| Specific gravity | 5.26 |
| Density | 5.26 – 5.3 |
From the Wikipedia article
Hematite ( HE(E)M-ə-tyte), also spelled as haematite, is a common iron oxide compound with the formula Fe2O3 and is widely found in rocks and soils. Hematite crystals belong to the rhombohedral lattice system which is designated the alpha polymorph of Fe2O3. It has the same crystal structure as corundum (Al2O3) and ilmenite (FeTiO3). With this crystal structure geometry it forms a complete solid solution at temperatures above 950 °C (1,740 °F).
Source
Source record: crystal-compendium/hematite/minerals.json. Fetched from English Wikipedia by the operator 2 October 2026.
https://en.wikipedia.org/wiki/Hematite — revision id 1371461042. Text and properties from Wikipedia, licensed CC BY-SA 4.0.