Ahrensite
A valid IMA mineral species
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Formula:
SiFe2O4
Colour:
Bluish-green
Specific Gravity:
4.135 (Calculated)
Crystal System:
Isometric
Member of:
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.
Isostructural with:
A silicate spinel and the Fe2+analogue of ringwoodite. There is at least a partial series with ringwoodite (Bindi et al., 2020).
Unique Identifiers
Mindat ID:
43891
Long-form identifier:
mindat:1:1:43891:7
GUID
(UUID V4):
(UUID V4):
9890f712-cc91-4bb0-b1d5-b96a781cce66
IMA Classification of Ahrensite
Approved
Approval year:
2013
First published:
2014
Classification of Ahrensite
9.AC.
9 : SILICATES (Germanates)
A : Nesosilicates
C : Nesosilicates without additional anions; cations in octahedral [6] coordination
9 : SILICATES (Germanates)
A : Nesosilicates
C : Nesosilicates without additional anions; cations in octahedral [6] coordination
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Ahr | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Ahrensite
Transparency:
Translucent
Colour:
Bluish-green
Density:
4.135 g/cm3 (Calculated)
Chemistry of Ahrensite
Mindat Formula:
SiFe2O4
Elements listed:
Crystallography of Ahrensite
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
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0000404 | Ahrensite | Yagi T, Marumo F, Akimoto S I (1974) Crystal structures of spinel polymorphs of Fe2SiO4 and Ni2SiO4 American Mineralogist 59 486-490 | 1974 | synthetic | 0 | 293 | |
0000748 | Ahrensite | Finger L W, Hazen R M, Yagi T (1979) Crystal structures and electron densities of nickel and iron silicate spinels at elevated temperature or pressure American Mineralogist 64 1002-1009 | 1979 | synthetic | 0 | 293 | |
0007404 | Ahrensite | Yamanaka T (1986) Crystal structures of Ni2SiO4 and Fe2SiO4 as a function of temperature and heating duration Physics and Chemistry of Minerals 13 227-232 | 1986 | synthetic | 0 | 293 | |
0007405 | Ahrensite | Yamanaka T (1986) Crystal structures of Ni2SiO4 and Fe2SiO4 as a function of temperature and heating duration Physics and Chemistry of Minerals 13 227-232 | 1986 | synthetic | 0 | 293 | |
0007406 | Ahrensite | Yamanaka T (1986) Crystal structures of Ni2SiO4 and Fe2SiO4 as a function of temperature and heating duration Physics and Chemistry of Minerals 13 227-232 | 1986 | synthetic | 0 | 293 | |
0007407 | Ahrensite | Yamanaka T (1986) Crystal structures of Ni2SiO4 and Fe2SiO4 as a function of temperature and heating duration Physics and Chemistry of Minerals 13 227-232 | 1986 | synthetic | 0 | 293 | |
0007408 | Ahrensite | Yamanaka T (1986) Crystal structures of Ni2SiO4 and Fe2SiO4 as a function of temperature and heating duration Physics and Chemistry of Minerals 13 227-232 | 1986 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
2.461 Å | (100) |
1.571 Å | (61) |
1.443 Å | (62) |
1.245 Å | (75) |
1.178 Å | (62) |
1.063 Å | (52) |
1.020 Å | (77) |
0.943 Å | (76) |
Comments:
From Type Description.
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 2: Planetesimal differentiation and alteration | 4.566-4.550 |
6 : Secondary asteroid phases | 4.566-4.560 |
Type Occurrence of Ahrensite
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 Ahrensite
Relationship of Ahrensite to other Species
Member of:
Other Members of this group:
Brunogeierite | Ge4+Fe2+2O4 | Iso. m3m (4/m 3 2/m) : Fd3m |
Filipstadite | (Fe3+0.5Sb5+0.5)Mn2O4 | Iso. |
Qandilite | (Mg,Fe3+)2(Ti,Fe3+,Al)O4 | Iso. m3m (4/m 3 2/m) : Fd3m |
Ringwoodite | (Mg,Fe2+)2SiO4 | Iso. m3m (4/m 3 2/m) : Fd3m |
Tegengrenite | (Mn3+0.5Sb5+0.5)Mg2O4 | Trig. 3 : R3 |
Ulvöspinel | TiFe2+2O4 | Iso. m3m (4/m 3 2/m) : Fd3m |
Related Minerals - Strunz-mindat Grouping
9.AC. | Poirierite | Mg2SiO4 |
9.AC.05 | Fayalite | Fe2+2SiO4 |
9.AC.05 | Forsterite | Mg2SiO4 |
9.AC.05 | Glaucochroite | CaMn2+SiO4 |
9.AC.05 | Kirschsteinite | CaFe2+SiO4 |
9.AC.05 | Laihunite | (Fe2+0.5◻0.5)Fe3+[SiO4] |
9.AC.05 | Liebenbergite | Ni2SiO4 |
9.AC.05 | Tephroite | Mn2+2SiO4 |
9.AC.10 | Monticellite | CaMgSiO4 |
9.AC.15 | Brunogeierite | Ge4+Fe2+2O4 |
9.AC.15 | Ringwoodite | (Mg,Fe2+)2SiO4 |
9.AC.20 | Chesnokovite | Na2[SiO2(OH)2] · 8H2O |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Ahrensite
mindat.org URL:
https://www.mindat.org/min-43891.html
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References for Ahrensite
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2013) New minerals and nomenclature modifications approved in 2013. CNMNC Newsletter No 16. Mineralogical Magazine, 77 (6) 2695-2709 doi:10.1180/minmag.2013.077.6.01
Ma, C., Tschauner, O., Liu, Y., Beckett, J.R., Rossman, G.R., Zuravlev, K., Prakapenka, V., Dera, P., Sinogeikin, S., Smith, J., Taylor, L.A. (2014) Discovery of Ahrensite gamma-Fe2SiO4 and Tissintite (Ca, Na, □) AlSi2O6: Two New High Pressure Minerals from the Tissint Martian Meteorite. 45th Lunar and Planetary Science Conference.
Biagioni, C., Pasero, M. (2014) The systematics of the spinel-type minerals: An overview. American Mineralogist, 99 (7) 1254-1264 doi:10.2138/am.2014.4816
Ma, Chi, Tschauner, Oliver, Beckett, John R., Liu, Yang, Rossman, George R., Zuravlev, Kirill, Prakapenka, Vitali, Dera, Przemyslaw, Sinogeikin, Stanislav, Smith, Jesse, Taylor, Lawrence A. (2014) First New Minerals from Mars: Discovery of Ahrensite γ-Fe2SiO4 and Tissintite (Ca,Na,□)AlSi2O6, Two High Pressure Phases from the Tissint Martian Meteorite. Eighth International Conference on Mars.
Localities for Ahrensite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
France | |
| Baziotis et al. (2018) |
Morocco (TL) | |
| Williams et al. (2013) +2 other references |
Nigeria | |
| Gu et al. (2022) |
Russia | |
| Bindi et al. (2015) |
Tunisia | |
| Benzerara et al. (2002) |
USA | |
| Tomioka et al. (2017) |
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