Mineral phase
IMA name
Feroxyhyte
IMA Code
Fox
Type
Class
non-silicate mineral
Compound type
oxide-hydroxide
Chemical composition
Formula
$Fe^{3+}O(OH)$
Chemical formula
FeO(OH)
Elemental formula
(Fe3+) O H (O-)
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
$Fe^{3+}$ Iron(III) cation element 1 constituent element main
$O$ Oxygen element 1 constituent element main
$(OH)^-$ Hydroxide anion chemical function 1 anionic radical main
Chemical functions
  Function Number
$(OH)^-$ 1
Chemical bonds
  Bond Number
$O^--H$ 1
Oxides
Formula $Fe_{2}O_{3}$ $H_{2}O$
Mass fraction (%) 89.86 10.14

Strunz

Class
oxides - hydroxides - arsenites (04)
Division
hydroxides (without V or U) (04.F)
Family
Hydroxides with OH, without H2O; sheets of edge-sharing octahedral (04.FE)
Code
04.FE.40

Dana

Major class
oxides and hydroxides (III)
Class
hydroxides and oxides containing hydroxyl (06)
Type
where X+++O OH (06.01)
Group
Heterogenite Group (06.01.04)
Code
06.01.04.04
Phase name
delta-FeO(OH)
Phase type
crystalline
Crystal system
hexagonal
Crystal class
unknown
Crystal class symbol
unknown
Crystal spacegroup
unknown
Molar mass
88.85 $g/mol$
Density
4.2 $g/cm^3$
State NTP
solid
Refringence type
uniaxial
Refringence sign
unknown
Pure color
brown
Color
yellow-brown, brown
Diaphaneity
opaque
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