Goethite
Goethite Basic information
- Product Name:
- Goethite
- Synonyms:
-
- Goethite: (Iron hydroxide oxide)
- Einecs 215-176-6
- IRON OXIDE PIGMENT YELLOW
- IRON(III) OXIDE, HYDRATED
- IRON (III) GAMMA-OXYHYDROXIDE
- IRON (III) HYDROXIDE, ALPHA
- IRON(III) HYDROXIDE
- IRON(III) HYDROXIDE OXIDE
- CAS:
- 1310-14-1
- MF:
- FeHO2
- MW:
- 88.85
- EINECS:
- 215-176-6
- Mol File:
- 1310-14-1.mol
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Goethite Chemical Properties
- Melting point:
- 350°C
- Density
- 3.8-4.4 g/cm3
- form
- crystalline
- Stability:
- Stable.
- EPA Substance Registry System
- Goethite (Fe(OH)O) (1310-14-1)
MSDS
- Language:English Provider:SigmaAldrich
- Language:English Provider:ALFA
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Goethite Usage And Synthesis
Description
Goethite is typically formed under oxidizing conditions as a weathering product of femferous minerals, siderite, pyrite, and magnetite, and is widespread as deposits in bogs. It is commonly associated with hematite, pyrolusite, manganite, calcite, quartz, lepidocrocite, clay minerals, and limonite. Hydrous iron oxide is also called limonite. By x-ray examination, most limonites are actually cryptocrystalline goethite with absorbed or capillary water (Palache, Berman, and Frondel 1944). Several excellent pigment ore sources are found in India. Domestic ochre is mined in Georgia and Virginia.
Physicochemical properties
| Chemical formula | αFeOOH.xH20 |
| Chemical composition of ore | 50% to 88% Fe203, 9% to 10% H20, balance silicate or clay minerals |
| Crystal class | Orthorhombic; dipyramidal |
| Habit | Prismatic and striated; also in tablets or scales, grading into acicular and long prismatic forms; also earthy |
| Physical | Cleavage [010] perfect, [100] less so, fracture uneven, hardness of 5.0-5.5 |
| Reaction mechanisms | Will form ferrites through solid-state reactions as noted under hemotite. Can also be converted from αFeOOH.xH20 to αFesO3 by heat and to ferromagnetic γfe2O3 by reduction and oxidation. |
| Melting point | Decomposes; naturals (finely ground) start to dehydroxylate at 190°C and is essentially dehydroxylated at 320°C; synthetics start at 180°C and are completely dehydroxylated at 300°C |
| Boiling point | Decomposes |
| Solubility | Considered insoluble in water and common organic solvents, 0.0015 gpl cold water |
| Index of refraction | 2.26-2.27 |
| Specific gravity | 3.3-4.0 |
| Magnetic | Antiferromagnetic |
Chemical Properties
solid. a-FeOOH, goethite [1310-14-1], has a diaspore structure whose color changes from green-yellow to brown-yellow with increasing particle size.
GoethiteSupplier
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Hubei Jusheng Technology Co.,Ltd.
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