Hematite
Hematite additionally spelled iron ore is that the mineral type of iron iii compound Fe2O3 one amongst many iron oxides. Its the oldest glorious iron(Fe) compound mineral and is widespread in rocks and soils. Hematite is a mineral that is typical but not often faceted as a treasure because it is opaque. It may commonly be found as attractive, faceted beads and carved cameos nonetheless. Hematite powder ended up being used by Native Us citizens being a face paint called ochre that is red. The compound that is polishing as rouge utilized on gold and silver is powdered Hematite. Faceted or cabochon Hematites are very attractive due to the silvery black color and polish that is mirror-like. iron ore and mineral type a whole primary solid solution at temperatures on top of 950°C 1 740°F Iron ore is a magnetic force material below the morin transition at 250 Kelvin K or 9.7 degrees Fahrenheit (°F) and a tilted antiferromagnet or weak magnetism on top of the morin transition and below its neel temperature at 948 K on top of that its paramagnHematite’s quality in jewellery was at its highest in Europe throughout the victorian era. Sure varieties of iron ore or iron oxide rich clay particularly armenian bole are employed in a coat. Iron ore is additionally employed in the art appreciate the creation of intaglio carven gems. Hematine may be an artificial material sold out as magnetic hematite.
| Category: | Oxide minerals |
| Formula: | Fe2O3 |
| iron(III) oxide | |
| Crystallography: | Trigonal – Hexagonal Scalenohedral |
| Crystal Habit: | Crystals complex rhombohedral, pseudocubic, prismatic, rarely scalenohedral, to 13 cm, with triangular striations on [0001] and [1011]; thin tabular, to micaceous or platy, commonly in rosettes; radiating fibrous, reniform, botryoidal or stalactitic masses, columnar; earthy, granular, oolitic, concretionary. |
| Twinning: | Penetration twins on [0001] or with [1010] as composition plane; also lamellar on [1011]. |
| Cleavage: | None observed; Parting on [0001] and [1011] due to twinning. |
| Fracture: | Irregular/Uneven to Subconchoidal |
| Tenacity: | Brittle |
| Hardness (Mohs): | 5.0 – 6.5 |
| Hardness (Vickers): | VHN100=1000 – 1100 kg/mm2 |
| Density: | 5.26 (g/cm3) |
| Luminescence: | None |
| Radioactivity: | Not Radioactive |
| Color: | Steel gray, Black, Blackish Red, Reddish Brown in thin slivers |
| Transparency: | Opaque, Translucent on thin edges |
| Luster: | Metallic, Sub-Metallic, Dull, Earthy |
| Refractive Index: | 2.87 – 3.22 Uniaxial ( – ) |
| Birefringence: | 0.280 (very high) |
| Dispersion: | Strong, ~0.203 |
| Pleochroism: | Weak; O = brownish red; E = yellowish red |
