Goethiet

Structural context

Goethite
Crystal System orthorhombicSpace Group Pnma

Chemical context

Stoichiometric formulas

Goethite
mindat.org
  • Feb. 23, 2025Fe3+O(OH)Previously \alpha-Fe#3+#O(OH)
  • March 13, 2023α-Fe3+O(OH)
IMA
  • March 13, 2023FeO(OH)
mineralogy.rocks
  • Aug. 30, 2022Fe3+O(OH)

Physical properties

ColorColor entities, recognized using a custom trained NER model
  • brownish black
  • yellow-brown
  • reddish brown
Color noteOriginal color note from the source
Brownish black, yellow-brown, reddish brown
StreakStreak entities, recognized using a custom trained NER model
  • yellowish brown
  • orange-yellow
  • ocher-yellow
Streak noteOriginal streak note from the source
Yellowish brown, orange-yellow, ocher-yellow
Lustre
Adamantine
Silky
Metallic
Dull
Fracture
Irregular/Uneven
Transparency
Opaque
Tenacity
brittle
Hardness
5—5.5
Measured density
4.27—4.29
Calculated density
4.18