Basic information Description Physicochemical properties Safety Supplier Related

Goethite

Basic information Description Physicochemical properties Safety Supplier Related

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)
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Safety Information

WGK Germany 
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MSDS

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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.

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