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Keilite

A valid IMA mineral species
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About KeiliteHide

08870880014948722299896.jpg
Klaus Keil
Formula:
(Fe2+,Mg)S
Colour:
Gray
Lustre:
Metallic
Specific Gravity:
3.958 (Calculated)
Crystal System:
Isometric
Name:
Named in honor of Klaus Keil (15 November 1934, Hamburg, Germany - 25 February 2022), Professor at the University of Hawai'i, Honolulu, Hawaii, USA, in recognition of his outstanding research on the mineralogy and petrography of chondritic meteorites. He is the former director of the Hawaii Institute of Geophysics and Planetology and the University of New Mexico Institute of Meteoritics. He pioneered the use of the electron microprobe to study meteorite samples and is one of the co-inventors of the energy dispersive X-ray spectrometer.
The iron analogue of Niningerite.


Unique IdentifiersHide

Mindat ID:
27196
Long-form identifier:
mindat:1:1:27196:9
GUID
(UUID V4):
8a840d15-fc2c-490a-8e66-f20ce3b5548c

IMA Classification of KeiliteHide

Classification of KeiliteHide

2.CD.10

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
C : Metal Sulfides, M: S = 1: 1 (and similar)
D : With Sn, Pb, Hg, etc.
Dana 7th ed.:
2.8.1.9

Mineral SymbolsHide

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

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

SymbolSourceReference
KeIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
KeThe Canadian Mineralogist (2019)The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download

Physical Properties of KeiliteHide

Metallic
Transparency:
Opaque
Colour:
Gray
Tenacity:
Brittle
Cleavage:
Distinct/Good
Parallel to (001), (010), and (100)
Density:
3.958 g/cm3 (Calculated)

Optical Data of KeiliteHide

Reflectivity:
WavelengthR
470nm27.2%
546nm26.7%
589nm26.4%
650nm26.0%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 27.2%.
Colour in reflected light:
grey
Comments:
Reflectance values of keilite increase with increasing Fe content. Data shown here are for Fe-rich, in air.

Chemistry of KeiliteHide

Mindat Formula:
(Fe2+,Mg)S

Crystallography of KeiliteHide

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fm3m
Cell Parameters:
a = 5.1717(18) Å
Unit Cell V:
138.32 ų
Z:
4

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0004274KeiliteKarwowski L, Kryza R, Przylibski T A (2007) New chemical and physical data on keilite from the Zaklodzie enstatite achondrite American Mineralogist 92 204-2092007Zaklodzie enstatite achondrite meteorite0293
0005801KeiliteShimizu M, Yoshida H, Mandarino J A (2002) The new mineral species keilite, (Fe,Mg)S, the iron-dominant analogue of niningerite The Canadian Mineralogist 40 1687-169220020293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.985 Å(8)
2.585 Å(100)
1.828 Å(60)
1.492 Å(15)
1.292 Å(7)
1.156 Å(13)
1.055 Å(10)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 1: Primary nebular phases4.567-4.561
4 : Primary chondrule phases4.566–4.561
Stage 2: Planetesimal differentiation and alteration4.566-4.550
5 : Primary asteroid phases4.566–4.560

Type Occurrence of KeiliteHide

General Appearance of Type Material:
Grains up to several hundred micrometers across
Place of Conservation of Type Material:
Hawaii Institute of Geophysics and Planetology, University of Hawaii, Honolulu, Hawaii, U.S.A. (specimen UH 13)
Geological Setting of Type Material:
Enstatite chondrite
Associated Minerals at Type Locality:
Reference:
Shimizu, M., Yoshida, H., Mandarino, J.A. (2002) The new mineral species keilite, (Fe,Mg)S, the iron-dominant analogue of niningerite. The Canadian Mineralogist: 40: 1687-1692.

Synonyms of KeiliteHide

Other Language Names for KeiliteHide

German:Keilit
Russian:Кейлит
Simplified Chinese:硫镁铁矿
Traditional Chinese:硫鎂鐵礦

Common AssociatesHide

Associated Minerals Based on Photo Data:
2 photos of Keilite associated with Kamacite(Fe,Ni)
2 photos of Keilite associated with EnstatiteMg2Si2O6

Related Minerals - Strunz-mindat GroupingHide

2.CD.SvetlanaiteSnSeOrth. mmm (2/m 2/m 2/m) : Pnma
2.CD.05HerzenbergiteSnSOrth. mmm (2/m 2/m 2/m)
2.CD.05TeallitePbSnS2Orth. mmm (2/m 2/m 2/m) : Pnma
2.CD.10AlabanditeMnSIso. m3m (4/m 3 2/m) : Fm3m
2.CD.10AltaitePbTeIso. m3m (4/m 3 2/m) : Fm3m
2.CD.10ClausthalitePbSeIso. m3m (4/m 3 2/m) : Fm3m
2.CD.10GalenaPbSIso. m3m (4/m 3 2/m) : Fm3m
2.CD.10Niningerite(Mg,Fe2+,Mn2+)SIso. m3m (4/m 3 2/m) : Fm3m
2.CD.10Oldhamite(Ca,Mg)SIso. m3m (4/m 3 2/m) : Fm3m
2.CD.10 vaQuiroguitePb23Sb6S32
2.CD.15aCinnabarHgSTrig. 3 2 : P31 2 1
2.CD.15bHypercinnabarHgSHex.

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 KeiliteHide

References for KeiliteHide

Reference List:

Localities for KeiliteHide

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 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.
Antarctica
 
  • Eastern Antarctica
    • Buckley Island quadrangle
      • Lewis Cliff
Bullock et al. (2012, March)
Bullock et al. (2012, March)
Bullock et al. (2012, March)
Bullock et al. (2012, March)
    • Pecora Escarpment
      • LaPaz Ice Field
Izawa et al. (2011)
    • Queen Maud Land
      • Queen Fabiola Mts
Bullock et al. (2012, March)
Bullock et al. (2012, March)
Bullock et al. (2012, March)
Bullock et al. (2012, March)
    • Victoria Land
      • Grosvenor Mountains
Keil et al. (2011)
Canada (TL)
 
  • Alberta
    • Sturgeon County
Shimizu et al. (2002) +1 other reference
France
 
  • Occitanie
    • Haute-Garonne
      • Toulouse
        • Saint-Jory
Shimizu et al. (2002)
Germany
 
  • Brandenburg
    • Havelland
- (n.d.)
Pakistan
 
  • Punjab Province
    • Khushab District
Shimizu et al. (2002) +1 other reference
Poland
 
  • Lublin Voivodeship
    • Zamość County
Przylibski et al. (2011) +1 other reference
Russia
 
  • Sakha
    • Northern Yakutia
      • Olenyok (Olenek) river basin
        • West Ukukit kimberlite field
Ashchepkov et al. (2021)
Sudan
 
  • Kassala
    • Gash delta
Bullock et al. (2012, March)
  • River Nile
Addi Bischoff et al. (2010) +1 other reference
Yemen
 
  • Hadhramaut Governorate
Bullock et al. (2012, March)
 
Mineral and/or Locality  
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