Oxy Hydroxide Alfa type
α-FeO(OH)
Chemical name
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)
Unit cell
a [Å]:4.65
b [Å]:10.02
c [Å]:3.04
Mohs hardness
5 - 5.5
Density [g/cm3]
3.3 - 3.4
Cleavage
perfect on {010}
Fracture / Tenacity
uneven to splintery