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Stöfflerite

A valid IMA mineral species
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05298120017761984142215.jpg
Stöfflerite, etc.

Northwest Africa 856 Martian meteorite, Northwest Africa Meteorites
05298120017761984142215.jpg
Stöfflerite, etc.

Northwest Africa 856 Martian meteorite, Northwest Africa Meteorites
05298120017761984142215.jpg
Stöfflerite, etc.

Northwest Africa 856 Martian meteorite, Northwest Africa Meteorites
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About StöffleriteHide

09799590017272473021868.jpg
Dieter Stöffler
Formula:
CaAl2Si2O8
Colour:
Colorless
Crystal System:
Tetragonal
Name:
Named in honor of Dieter Stöffler, expert on meteorites and former Director of the Natural History Museum Berlin, Germany.
A high-pressure polymorph of anorthite, found in shock veins in meteorites.


Name EncodingHide

ASCII-7:
Stofflerite

Unique IdentifiersHide

Mindat ID:
52171
Long-form identifier:
mindat:1:1:52171:2

IMA Classification of StöffleriteHide

Classification of StöffleriteHide

Strunz-mindat (2026):
9.FA.70

9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
A : Tektosilicates without additional non-tetrahedral anions

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference for Standard
SffIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of StöffleriteHide

Transparency:
Transparent
Colour:
Colorless

Chemistry of StöffleriteHide

Mindat Formula:
CaAl2Si2O8
Element Weights:
Element% weight
O46.007 %
Si20.190 %
Al19.397 %
Ca14.406 %

Calculated from ideal end-member formula.
Elements listed:
Al, Ca, O, Si - search for minerals with similar chemistry

Crystallography of StöffleriteHide

Crystal System:
Tetragonal
Class (H-M):
4/m - Dipyramidal
Space Group:
I4/m
Cell Parameters:
a = 9.255(1) Å, c = 2.745(3) Å
Ratio:
a:c = 1 : 0.297
Unit Cell V:
235.12 ų (Calculated from Unit Cell)
Z:
2

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 2: Planetesimal differentiation and alteration4.566-4.550
6 : Secondary asteroid phases4.566-4.560

Type Occurrence of StöffleriteHide

Type Locality:
ⓘ Northwest Africa 856 Martian meteorite (NWA 856; Djel Ibone Martian meteorite), Northwest Africa Meteorites
General Appearance of Type Material:
Fine-grained crystalline masses with a grain size of 20+/-5 nm.
Place of Conservation of Type Material:
E. Stolper's Martian Meteorite Collection, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA, thin section of NWA 856.
Geological Setting of Type Material:
Meteorite shock melt pocket.
Associated Minerals at Type Locality:
'Maskelynite'Zagamiite
Reference:
Tschauner, Oliver, Ma, Chi, Spray, John G., Greenberg, Eran, Prakapenka, Vitali B. (2021) Stöfflerite, (Ca,Na)(Si,Al)4O8 in the hollandite structure: A new high-pressure polymorph of anorthite from martian meteorite NWA 856. American Mineralogist, 106 (4) 650-655 doi:10.2138/am-2021-7563

Other Language Names for StöffleriteHide

Common AssociatesHide

Associations Based on Photo Data:
1 photo of Stöfflerite associated with ZagamiiteCaAl2Si3.5O11
1 photo of Stöfflerite associated with Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
1 photo of Stöfflerite associated with 'Maskelynite'
1 photo of Stöfflerite associated with StishoviteSiO2

Related Minerals - Strunz-mindat GroupingHide

9.FA.BonaccorsiiteKK2Na3(Al6Si36)O84Hex. 6/mmm(6/m2/m2/m) : P6/mcc
9.FA.HexacelsianBaAl2Si2O8Hex. 6/mmm(6/m2/m2/m) : P63/mcm
9.FA.Wodegongjieite KCa3(Al7Si9)O32Hex. 6/mmm(6/m2/m2/m) : P6/mcc
9.FA.05Panunzite(K,Na)AlSiO4Hex. 6 : P63
9.FA.05Yoshiokaite(Ca,Na)[Al(Al,Si)O4]Trig. 3 : P3
9.FA.05NephelineNa3K(Al4Si4O16)Hex. 6 : P63
9.FA.05TrinephelineNaAlSiO4Hex. 6 : P61
9.FA.05Davidsmithite(Ca,◻)2Na6Al8Si8O32Hex. 6 : P63
9.FA.05KaliophiliteKAlSiO4Trig. 3 : P3
9.FA.05KalsiliteKAlSiO4Hex. 622 : P6322
9.FA.05'Carnegieite'NaAlSiO4Tric.
9.FA.05MegakalsiliteKAlSiO4Hex. 6 : P63
9.FA.05TrikalsiliteK2NaAl3(SiO4)3Hex. 6 : P63
9.FA.10MalinkoiteNaBSiO4Hex. 6 : P63
9.FA.15VirgiliteLiAlSi2O6Hex. 622 : P6222
9.FA.25LisitsyniteKBSi2O6Orth. 222 : P222
9.FA.30FerrisanidineK[Fe3+Si3O8]Mon. 2/m : B2/m
9.FA.30Buddingtonite(NH4)(AlSi3O8)Mon. 2 : P21
9.FA.30RubiclineRb(AlSi3O8)Mon. 2/m : B2/m
9.FA.30'Monalbite'NaAlSi3O8Mon. 2/m : B2/m
9.FA.30MicroclineK(AlSi3O8)Tric. 1
9.FA.30 va'Germanate-celsian'BaAl2Ge2O8
9.FA.30CelsianBa(Al2Si2O8)Mon. 2/m
9.FA.30SanidineK(AlSi3O8)Mon. 2/m : B2/m
9.FA.30OrthoclaseK(AlSi3O8)Mon. 2/m : B2/m
9.FA.35ReedmergneriteNaBSi3O8Tric. 1 : P1
9.FA.35AlbiteNa(AlSi3O8)Tric. 1
9.FA.35AnorthiteCa(Al2Si2O8)Tric. 1 : P1
9.FA.40ParacelsianBa(Al2Si2O8)Mon. 2/m : P21/b
9.FA.45SvyatoslaviteCa(Al2Si2O8)Mon. 2 : P21
9.FA.45KumdykoliteNa(AlSi3O8)Orth. mmm(2/m2/m2/m) : Pnnm
9.FA.50SlawsoniteSr(Al2Si2O8)Mon. 2/m : P21/b
9.FA.55LisetiteCaNa2Al4Si4O16Orth. mm2
9.FA.60StronalsiteNa2SrAl4Si4O16Orth.
9.FA.60BanalsiteNa2BaAl4Si4O16Orth. mm2 : Iba2
9.FA.65MaleeviteBaB2Si2O8Orth. mmm(2/m2/m2/m) : Pnma
9.FA.65PekoviteSrB2Si2O8Orth. mmm(2/m2/m2/m) : Pnma
9.FA.65DanburiteCaB2Si2O8Orth. mmm(2/m2/m2/m)
9.FA.70LiebermanniteKAlSi3O8Tet. 4/m : I4/m
9.FA.70LinguniteNaAlSi3O8Tet. 4/m : I4/m
9.FA.75PfaffenbergiteKNa3(Al4Si12)O32Hex. 6/mmm(6/m2/m2/m) : P6/mcc
9.FA.75KokchetaviteK(AlSi3O8)Hex. 6/mmm(6/m2/m2/m) : P6/mcc

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.

Internet Links for StöffleriteHide

References for StöffleriteHide

Localities for StöffleriteHide

Showing 4 localities.

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.
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Locality ListHide

- 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.
Canada
 
  • Québec
    • Côte-Nord
      • Manicouagan RCM
Spray et al. (2016) +1 other reference
India
 
  • Bihar
    • Gaya District
Ma et al. (2021)
Nigeria
 
  • Katsina
    • Faskari
Ma et al. (2024)
Northwest Africa Meteorites (TL)
 
Hålenius et al. (2017) +1 other reference
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