Keilite
A valid IMA mineral species
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About Keilite
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.
Type Locality:
Polymorph of:
Unique Identifiers
Mindat ID:
27196
Long-form identifier:
mindat:1:1:27196:9
GUID
(UUID V4):
(UUID V4):
8a840d15-fc2c-490a-8e66-f20ce3b5548c
IMA Classification of Keilite
Approved
IMA Formula:
FeS
Approval year:
2001
First published:
2002
Classification of Keilite
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.
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 Symbols
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.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Symbol | Source | Reference |
---|---|---|
Ke | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Ke | The 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 Keilite
Metallic
Transparency:
Opaque
Colour:
Gray
Tenacity:
Brittle
Cleavage:
Distinct/Good
Parallel to (001), (010), and (100)
Parallel to (001), (010), and (100)
Density:
3.958 g/cm3 (Calculated)
Optical Data of Keilite
Reflectivity:
Wavelength | R |
---|---|
470nm | 27.2% |
546nm | 26.7% |
589nm | 26.4% |
650nm | 26.0% |
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 Keilite
Mindat Formula:
(Fe2+,Mg)S
Elements listed:
Crystallography of Keilite
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 Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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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) |
---|---|---|---|---|---|---|---|
0004274 | Keilite | Karwowski L, Kryza R, Przylibski T A (2007) New chemical and physical data on keilite from the Zaklodzie enstatite achondrite American Mineralogist 92 204-209 | 2007 | Zaklodzie enstatite achondrite meteorite | 0 | 293 | |
0005801 | Keilite | 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 | 2002 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
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 Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 1: Primary nebular phases | 4.567-4.561 |
4 : Primary chondrule phases | 4.566–4.561 |
Stage 2: Planetesimal differentiation and alteration | 4.566-4.550 |
5 : Primary asteroid phases | 4.566–4.560 |
Type Occurrence of Keilite
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 Keilite
Other Language Names for Keilite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
2.CD. | Svetlanaite | SnSe |
2.CD.05 | Herzenbergite | SnS |
2.CD.05 | Teallite | PbSnS2 |
2.CD.10 | Alabandite | MnS |
2.CD.10 | Altaite | PbTe |
2.CD.10 | Clausthalite | PbSe |
2.CD.10 | Galena | PbS |
2.CD.10 | Niningerite | (Mg,Fe2+,Mn2+)S |
2.CD.10 | Oldhamite | (Ca,Mg)S |
2.CD.10 va | Quiroguite | Pb23Sb6S32 |
2.CD.15a | Cinnabar | HgS |
2.CD.15b | Hypercinnabar | HgS |
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 Keilite
mindat.org URL:
https://www.mindat.org/min-27196.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Keilite
Reference List:
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 (6) 1687-1692 doi:10.2113/gscanmin.40.6.1687
Localities for Keilite
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.
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Abee meteorite, Sturgeon County, Alberta, Canada