Luogufengite

Fe2O3
IMA status
  • Approved
IMA symbol
Lgf
IMA approved
2016
Also known as
  • IMA2016-005
  • Luogufengiet

Where it forms, where it's found

Geological setting

In late Pleistocene basaltic scoria from the Menan Volcanic Complex nearby Rexburg, Idaho, USA.

Type locality
Menan volcanic complex
  1. Rexburg area
  2. Madison County
  3. Idaho
  4. USA

43.7842°, -111.9731°

1recorded occurrences
Source · OpenStreetMap

Crystallography

Crystal system
Orthorhombic
Space group
#35
Cell parameters
a = 5.0647(3) Å · b = 8.7131(36) Å · c = 9.3842(5) Å
Ratio a:b:c
1 : 1.720 : 1.853
Z
4
Twinning

Display (110) twins with twin boundaries of (110), (100), and (130) due to their pseudo-hexagonal symmetry.

Type-locality form

As euhedral or semi-euhedral crystal with size ranging from ~20 to ~120 nm.

Crystal structure

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
26FeIronIron255.845111.690
69.94%
8OOxygenOxygen315.99947.997
30.06%
Total159.687100.00%

Mass share = atoms × atomic mass ÷ molar mass × 100

From IMA formula

Synonyms

  • IMA2016-005
  • Luogufengiet

In other languages

German
IMA 2016-005 · Luogufengit
Chinese
罗氏铁矿

Classification

Strunz
10th ed.

4.CB.90

  • 4OxidesClass
  • 4.CMetal: Oxygen = 2: 3,3: 5, and similarDivision
  • 4.CBWith medium-sized cationsGroup
  • 4.CB.90LuogufengiteSpecies

Group, growth & confusion

Commonly confused with
1 mineral

Literature, links & citation

Citations
  1. 2016Lee, S., and Xu, H. (2016) A Size-Dependent Phase Map and Phase Transformation Kinetics for Nanometric Iron (III) Oxides (γ→ ε→ α Pathway). The Journal of Physical Chemistry C.
  2. 2016Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2016) New minerals and nomenclature modifications approved in 2016, CNMNC Newsletter no 31. Mineralogical Magazine, 80 (4) 691-697 doi:10.1180/minmag.2016.080.083DOI: 10.1180/minmag.2016.080.083
  3. 2017Xu, Huifang; Lee, Seungyeol; Xu, Hongwu (2017) Luogufengite: A new nano-mineral of Fe2O3 polymorph with giant coercive field. American Mineralogist, 102 (4). 711-719 doi:10.2138/am-2017-5849DOI: 10.2138/am-2017-5849
  4. 2022(2022) Luogufengite. Handbook of Mineralogy. Mineralogical Society of America
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Luogufengite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/luogufengite-47789},
  note      = {Accessed 2026-05-11}
}