Keilite Mineral Data

Keilite Mineral Data

General Keilite Information

Chemical Formula:

(Fe,Mg)S

Composition:

Molecular Weight = 76.71 gm

Calcium 2.09 % Ca

Magnesium 10.46 % Mg

Manganese 3.58 % Mn

Chromium 2.03 % Cr

Iron 40.04 % Fe

Sulfur 41.80 % S

______

100.00 %

Empirical Formula:

Fe²⁺_0.55Mg_0.33Mn²⁺_0.05Ca_0.04Cr_0.03S

Environment:

Found in Abee enstitie chondrite, Alberta Canada. (Fe-dominant analogue of niningerite)

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

Abee enstatite chondrite, Abee, Alberta, Canada. Link to MinDat.org Location Data.

Name Origin:

Named after Klaus Keil (1934-), professor at the University of Hawaii.

Synonym:

IMA2001-053

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Keilite Crystallography

Cell Dimensions:

a = 5.2, Z = 4; V = 140.61 Den(Calc)= 3.62

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F m3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.585(1)(200), 2.985(0.8)(111), 1.828(0.6)(220),1.492(0.15)(222), 1.156(0.13)(420), 1.055(0.1)(422), 1.292(0.07)(400),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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Shimizu M , Yoshida H , Mandarino J A , The Canadian Mineralogist , 40 (2002) p.1687-1692, The new mineral species keilite, (Fe,Mg)S, the iron-dominant, analogue of niningerite

Physical Properties of Keilite

Cleavage:

None

Color:

Gray.

Diaphaniety:

Opaque

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Luster:

Metallic

Optical Properties of Keilite

RL Color:

Gray.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Keilite in Air**
λ	R	∑ R(λ)
400 nm	27.20
420 nm	27.10
440 nm	27.60
460 nm	27.20
470 nm	27.20
480 nm	27.10
500 nm	26.60
520 nm	26.60
540 nm	26.60
546 nm	26.70
560 nm	26.50
580 nm	26.70
589 nm	26.40
600 nm	25.90
620 nm	26.20
640 nm	26.10
650 nm	26.30
660 nm	25.90
680 nm	26.00
700 nm	25.90

**Standardized Intensity (100%) Reflection Spectra of Keilite in Oil**
λ	R	∑ R(λ)
400 nm	11.80
420 nm	12.30
440 nm	12.80
460 nm	12.20
470 nm	12.20
480 nm	12.10
500 nm	12.00
520 nm	11.80
540 nm	11.80
546 nm	11.90
560 nm	11.70
580 nm	11.70
589 nm	11.70
600 nm	11.90
620 nm	11.70
640 nm	11.60
650 nm	11.70
660 nm	11.70
680 nm	11.30
700 nm	11.10

**Calculated Relative Intensity Colors of Keilite in Air**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	320%	340%
R

**Calculated Relative Intensity Colors of Keilite in Oil**
Relative Intensity	0%	80%	100%	160%	240%	320%	400%	480%	560%	640%	720%	760%
R

Calculated Properties of Keilite

Electron Density:

r_electron=3.49 gm/cc
note: r_Keilite=3.62 gm/cc.

Fermion Index

Fermion Index = 0.02403
Boson Index = 0.97597

Photoelectric:

PE_Keilite= 16.15 barns/electron
U=PE_Keilite x r_electron= 56.43 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Keilite is Not Radioactive

Keilite Classification

Dana Class:

2.8.1.9 (2)Sulfides - Including Selenides and Tellurides

(2.8)where Am Bn Xp, with (m+n):p=1:1

(2.8.1)Galena Group (Isometric: Fm3m)

2.8.1.1 Galena PbS F m3m 4/m 3 2/m

2.8.1.2 Clausthalite PbSe F m3m 4/m 3 2/m

2.8.1.3 Altaite PbTe F m3m 4/m 3 2/m

2.8.1.4 Alabandite MnS F m3m 4/m 3 2/m

2.8.1.5 Oldhamite (Ca,Mg,Fe)S F m3m 4/m 3 2/m

2.8.1.6 Niningerite (Mg,Fe,Mn)S F m3m 4/m 3 2/m

2.8.1.7 Borovskite Pd3SbTe4 F m3m 4/m 3 2/m

2.8.1.8 Crerarite (Pt,Pb)Bi3(S,Se)4-x(x~0.7) F m3m 4/m 3 2/m

2.8.1.9 Keilite ! (Fe,Mg)S F m3m 4/m 3 2/m

Strunz Class:

II/C.15-05 II - Sulfides and sulphosalts

II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1

II/C.15 - Galenite group

II/C.15-05 Keilite (Fe,Mg)S F m3m 4/m 3 2/m

II/C.15-10 Niningerite (Mg,Fe,Mn)S F m3m 4/m 3 2/m

II/C.15-20 Oldhamite (Ca,Mg,Fe)S F m3m 4/m 3 2/m

II/C.15-30 Alabandite MnS F m3m 4/m 3 2/m

II/C.15-40 Galena PbS F m3m 4/m 3 2/m

II/C.15-50 Clausthalite PbSe F m3m 4/m 3 2/m

II/C.15-60 Altaite PbTe F m3m 4/m 3 2/m

II/C.15-70 Crerarite (Pt,Pb)Bi3(S,Se)4-x(x~0.7) F m3m 4/m 3 2/m

Other Keilite Information

References:

NAME( CanMin, 41:814) PHYS. PROP.(CanMin, 41:814) OPTIC PROP.(CanMin, 41:814)

See Also:

Links to other databases for Keilite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Keilite

(Fe,Mg)S
Dana No: 2.8.1.9 Strunz No: II/C.15-05
Locality:

Notes: