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Goethite

CAS No.
1310-14-1
Chemical Name:
Goethite
Synonyms
E 172;FeO(OH);GOETHITE;GOETHITE;EISENOXID GELB;Einecs 215-176-6;FERRISPEC(TM) GC;IRONOXYHYDROXIDE;YELLOW IRON OXIDE;Goethite (Fe(OH)O)
CBNumber:
CB8243072
Molecular Formula:
FeHO2
Formula Weight:
88.85
MOL File:
1310-14-1.mol

Goethite 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)

SAFETY

Risk and Safety Statements

WGK Germany  -

Goethite Chemical Properties,Uses,Production

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

Goethite Preparation Products And Raw materials

Raw materials

Preparation Products

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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 IRON (III) HYDROXIDE, GAMMA GOETHITE IRON PIGMENT YELLOW IRON (III) ALPHA-OXYHYDROXIDE FERRIC HYDROXY OXIDE FERRISPEC(R) PL COLOR YELLOW IRON OXIDE FERRISPEC(TM) GC E 172 EISENOXID GELB YELLOW IRON OXIDE Goethite (Fe(OH)O) FeO(OH) Iron(III)oxidehydroxide IRONOXYHYDROXIDE GOETHITE Iron Oxyhydroxide Nanowire 1310-14-1