subject: The Mineralogy Character Of Limonite Ore [print this page] Limonite is a hydrated oxide of iron ore, is generated by other mineral weathering, the most widely distributed in nature, but deposits buried a large amount of rare. Its chemical formula is nFe2O3 mH2O (n = 1-3, m = 1-4). Limonite is actually goethite (FeOOH by) water, goethite (FeOOH by nH2O) lepidocrocite (FeOOH by), water lepidocrocite (FeOOH by nH2O) iron oxide with different crystalline water and muddy mixtures; because these mineral grains is small and difficult to distinguish, it is referred to as "limonite".
Goethite and lepidocrocite in the chemical composition is similar, but the crystal morphology is different. Often has needle-like goethite, columnar crystals, aggregates form was usually bean-shaped, kidney-shaped or bell emulsion, sometimes showed a dense block or earthy; the lepidocrocite often has flaky crystals, aggregates form is usually scaly or fibrous. (Iron ore process mineralogy study)
Because it belongs to the weathering products of iron minerals, the composition of impure water content changes, "also contains copper, lead, nickel, cobalt, gold. Usually was a yellowish brown to brown black, streak brown, semi-metallic luster, kidney-shaped, blocky, bell emulsion, grape-like, nodular, oolitic, porous-like or powder form, but also often has nodular or yellow iron ore crystal artifacts, also was a small needle-like crystalline. In the kidney-shaped, bell milky limonite surface often a layer of shiny asphalt black shell, such as "glass head. Containing Fe about 62% of its theoretical, O 27% H2O, 11%, the hardness varies with the mineral form, Mohs hardness of 1-4, the relative density of 3.3-4, fracture irregular-shaped magnetic weak. (Brown iron ore physical properties)
The limonite is the role of supergene product of the main causes of the type of weathering and sedimentary.
The weathering limonite iron sulfides, oxides, carbonates, silicates and other minerals, formed after the oxidation and hydration, this role is called limonitization. Limonite oxidation with metal deposits outcrop distribution of a certain area, known as the "iron hat", more than the original ore and surrounding rock iron mineral limonitization made. Generally based on the color of the "iron hat" structure and associated minerals contained in trace elements and secondary logo be inferred that the deep primary deposit types, therefore, the "iron hat" is a good prospecting criteria. Limonite was a large area of distribution and a large number of enrichment can be used as the iron ore deposits mined. (Brown iron ore beneficiation process Overview)
Sedimentary limonite often marine and lake deposition, condensed by the ferric hydroxide colloidal solution, can be a large concentration of deposits.
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