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Ahrensite

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Formula:
SiFe2O4
Colour:
bluish-green
Specific Gravity:
4.135 (Calculated)
Crystal System:
Isometric
Name:
The name honors Thomas J. Ahrens (April 25, 1936 – November 24, 2010), a geophysicist at the California Institute of Technology, for his many fundamental contributions to high-pressure mineral physics research.
A silicate spinel and the Fe2+analogue of ringwoodite.


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Classification of AhrensiteHide

Approved
Approval Year:
2013
First Published:
2014
9.AC.

9 : SILICATES (Germanates)
A : Nesosilicates
C : Nesosilicates without additional anions; cations in octahedral [6] coordination

Physical Properties of AhrensiteHide

Transparency:
Translucent
Colour:
bluish-green
Density:
4.135 g/cm3 (Calculated)

Chemical Properties of AhrensiteHide

Formula:
SiFe2O4
IMA Formula:
Fe2(SiO4)

Crystallography of AhrensiteHide

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Cell Parameters:
a = 8.1629(7) Å
Unit Cell V:
543.92 ų (Calculated from Unit Cell)
Z:
8
Comment:
Fd-3m

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.461(100)
1.571(61)
1.443(62)
1.245(75)
1.178(62)
1.063(52)
1.020(77)
0.943(76)
Comments:
From Type Description.

Type Occurrence of AhrensiteHide

General Appearance of Type Material:
5–20 μm polycrystalline aggregates consisting of submicron-sized crystals of 50–400 nm in diameter with grain size generally increasing towards the melt pocket
Place of Conservation of Type Material:
Type material is in Tissint sections UT1 and UT2 deposited in the Meteorite Collection of the Frank H. McClung Museum at the University of Tennessee, Knoxville, Tennessee, USA
Geological Setting of Type Material:
Shock melted Martian meteorite (the Tissint Martian meteorite)
Associated Minerals at Type Locality:
Reference:
Ma, C., Tschauner, O., Beckett, J.R., Liu, Y., Rossman, G.R., Sinogeikin, S.V., Smith, J.S., Taylor, L.A. (2016): Ahrensite, γ-Fe2SiO4, a new shock-metamorphic mineral from the Tissint meteorite: Implications for the Tissint shock event on Mars. Geochimica et Cosmochimica Acta, 184:240-256.

Synonyms of AhrensiteHide

Relationship of Ahrensite to other SpeciesHide

Other Members of this group:
BrunogeieriteGe4+Fe2+2O4Iso. m3m (4/m 3 2/m) : Fd3m
Filipstadite(Sb0.5Fe0.5)Mn2O4Iso.
Qandilite(Mg,Fe3+)2(Ti,Fe3+,Al)O4
Ringwoodite(Mg,Fe2+)2SiO4Iso. m3m (4/m 3 2/m) : Ia3d
UlvöspinelTiFe2O4Iso. m3m (4/m 3 2/m) : Fd3m

Related Minerals - Nickel-Strunz GroupingHide

9.AC.05FayaliteFe2+2SiO4Orth.
9.AC.05ForsteriteMg2SiO4Orth. mmm (2/m 2/m 2/m)
9.AC.05GlaucochroiteCaMn2+SiO4Orth.
9.AC.05KirschsteiniteCaFe2+SiO4Orth. mmm (2/m 2/m 2/m) : Pnma
9.AC.05LaihuniteFe2+Fe3+2(SiO4)2Mon.
9.AC.05Liebenbergite(Ni,Mg)2SiO4Orth.
9.AC.05TephroiteMn2+2SiO4Orth. mmm (2/m 2/m 2/m)
9.AC.10MonticelliteCaMgSiO4Orth.
9.AC.15BrunogeieriteGe4+Fe2+2O4Iso. m3m (4/m 3 2/m) : Fd3m
9.AC.15Ringwoodite(Mg,Fe2+)2SiO4Iso. m3m (4/m 3 2/m) : Ia3d
9.AC.20ChesnokoviteNa2[SiO2(OH)2] · 8H2OOrth. mmm (2/m 2/m 2/m) : Ibca

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 AhrensiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Ma, C., Tschauner, O., Liu, Y. and Sinogeikin, S. (2013) Ahrensite, IMA 2013-028. CNMNC Newsletter No. 16, August 2013, page 2707; Mineralogical Magazine, 77, 2695-2709.
Ma, C., Tschauner, O., Liu, Y., Beckett, J. R., Rossman, G. R., Zuravlev, K., ... & Taylor, L. A. (2014, March). Discovery of Ahrensite gamma-Fe2SiO4 and Tissintite (Ca, Na, □) AlSi2O6: Two New High Pressure Minerals from the Tissint Martian Meteorite. In Lunar and Planetary Science Conference (Vol. 45, p. 1222).
Ma, C., Tschauner, O., Beckett, J.R., Liu, Y., Rossman, G.R., Sinogeikin, S.V., Smith, J.S., Taylor, L.A. (2016): Ahrensite, γ-Fe2SiO4, a new shock-metamorphic mineral from the Tissint meteorite: Implications for the Tissint shock event on Mars. Geochimica et Cosmochimica Acta, 184:240-256.
Biagioni, C. & Pasero, M. (2014): The systematics of the spinel-type minerals: an overview. American Mineralogist, 99: 1254-1264.

Internet Links for AhrensiteHide

Localities for AhrensiteHide

ⓘ - 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.
Morocco (TL)
 
  • Souss-Massa Region
    • Tata Province
Ma, C., Tschauner, O., Liu, Y. and Sinogeikin, S. (2013) Ahrensite, IMA 2013-028. CNMNC Newsletter No. 16, August 2013, page 2707; Mineralogical Magazine, 77, 2695-2709.
Russia
 
  • Koriak Autonomous Okrug
    • Koryak Upland (Koriak; Koriakskhiye)
      • Iomrautvaam Massif
        • Chetkinvaiam tectonic melange
          • Khatyrka river
            • Listvenitovyi stream
Bindi, L., Yao, N., Lin, C., Hollister, L. S., Andronicos, C. L., Distler, V. V., ... & Steinhardt, W. M. (2015). Decagonite, Al71Ni24Fe5, a quasicrystal with decagonal symmetry from the Khatyrka CV3 carbonaceous chondrite. American Mineralogist, 100(10), 2340-2343.
USA
 
  • Texas
    • Randall Co.
Tomioka, N. & Miyahara, M. (2017) High-pressure minerals in shocked meteorites: Meteoritics & Planetary Science 52(9): 2017-2039. (Sept 2017).
Mineral and/or Locality  
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