Iron Oxy Hydroxide Alfa type
α-FeO(OH)
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Chemical name
Iron Oxy Hydroxide Alfa type |
|
Mineral name
Goethite |
|
Chemical formula
α-FeO(OH) |
|
Crystal system
orhorhombic |
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Crystal Class
orthorhombic-dipyramidal (2/m 2/m 2/m) |
|
Space Group
Pbnm |
|
Unit cell
a [Å]:4.65 b [Å]:10.02 c [Å]:3.04 |
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Molecular weight [g/mol]
88.85 |
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Formula units
Z=4 |
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Mohs hardness
5 - 5.5 |
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Density [g/cm3]
3.3 - 3.4 |
|
Cleavage
perfect on {010} |
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Fracture / Tenacity
uneven to splintery |
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Color
Vivid, dark orange, opaque crystals |
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Refractive Index
Opaque to sub-translucen |
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Solubility in water
insoluble at pH 7 |
