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Iron Oxy Hydroxide Alfa type

α-FeO(OH)

Iron Oxy Hydroxide Alfa type - α-FeO(OH) Iron Oxy Hydroxide Alfa type - α-FeO(OH) Iron Oxy Hydroxide Alfa type - α-FeO(OH) Iron Oxy Hydroxide Alfa type - α-FeO(OH) Iron Oxy Hydroxide Alfa type - α-FeO(OH)
Chemical name
Iron Oxy Hydroxide Alfa type
Mineral name
Goethite
Chemical formula
α-FeO(OH)
Crystal system
orhorhombic
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
Molecular weight [g/mol]
88.85
Formula units
Z=4
Mohs hardness
5 - 5.5
Density [g/cm3]
3.3 - 3.4
Cleavage
perfect on {010}
Fracture / Tenacity
uneven to splintery
Color
Vivid, dark orange, opaque crystals
Refractive Index
Opaque to sub-translucen
Solubility in water
insoluble at pH 7
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