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Luogufengite

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Formula:
Fe2O3
Crystal System:
Orthorhombic
Polymorph of:
An Al-bearing ε-Fe2O3, a Fe2O3 polymorph. The structure is determined.
An oxidation product of Fe-bearing basaltic glass at high temperature. Luogufengite is an important mineral that records paleomagnetism of volcanic rocks because of its large magnetic coercivity. This unique magnetic property of the mineral may explain the observed unusually high-remanent magnetization in some igneous and metamorphic rocks and even martian rocks with high-remanent magnetization (Xu et al. 2017).


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Classification of LuogufengiteHide

Approved
Approval Year:
2016
First Published:
2017

Chemical Properties of LuogufengiteHide

Formula:
Fe2O3

Crystallography of LuogufengiteHide

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Pna21
Cell Parameters:
a = 5.0647(3) Å, b = 8.7131(36) Å, c = 9.3842(5) Å
Ratio:
a:b:c = 0.581 : 1 : 1.077
Unit Cell V:
414.12 ų (Calculated from Unit Cell)
Z:
4
Twinning:
Display (110) twins with twin boundaries of (110), (100), and (130) due to their pseudo-hexagonal symmetry.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.198(27)
2.944(25)
2.697(100)
2.525(40)
2.437(32)
1.716(24)
1.505(41)
1.455(37)

Type Occurrence of LuogufengiteHide

General Appearance of Type Material:
As euhedral or semi-euhedral crystal with size ranging from ~20 to ~120 nm.
Place of Conservation of Type Material:
Collections of the Geology Museum of the Department of Geoscience, University of Wisconsin, 1215 West Dayton Street, Madison, WI 53706, USA (specimen numbers: UWGM 2341, UWGM 2342, and UWGM 2343)
Geological Setting of Type Material:
In late Pleistocene basaltic scoria from the Menan Volcanic Complex nearby Rexburg, Idaho, USA
Associated Minerals at Type Locality:

Synonyms of LuogufengiteHide

Other Language Names for LuogufengiteHide

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for LuogufengiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Xu, H., Lee, S. (2016): Luogufengite, IMA 2016-005. CNMNC Newsletter No. 31, June 2016, page 695; Mineralogical Magazine: 80: 691–697
Lee, S., & 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.
Xu, H., Lee, S., Xu, H. (2017): Luogufengite: A new nano-mineral of Fe2O3 polymorph with giant coercive field. American Mineralogist: 102: 711-719

Internet Links for LuogufengiteHide

Localities for LuogufengiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
USA (TL)
 
  • Idaho
    • Madison Co.
      • Rexburg area
Xu, H., Lee, S. (2016): Luogufengite, IMA 2016-005. CNMNC Newsletter No. 31, June 2016, page 695; Mineralogical Magazine: 80: 691–697; Xu, H., Lee, S., Xu, H. (2017): Luogufengite: A new nano-mineral of Fe2O3 polymorph with giant coercive field. American Mineralogist: 102: 711-719
Mineral and/or Locality  
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