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Kieftite (Kieftit)

Collectors Summary

Color zinnweiß
Streak color grau
Lustre hoher Metallglanz
Hardness (Mohs) 5.25
Cleavages keine
Fracture muschelig
Crystal System kubisch, Im3
Morphology Tracht aus {100}, {110} und {111}

Chemism

Chemical formula

CoSb3

Empirical formula (analysis)

(Co0.91Ni0.05Fe0.02Cu0.02)(Sb2.97Cl0.03)

Chemical composition

Antimon, Kobalt

Unit weight: 421.642806819 u; Number of atoms in the formula: 4

Info

Empirical formula:

(Co0.91Ni0.05Fe0.02Cu0.02)(Sb2.97Cl0.03)

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Chlorine

Cl

0.25

0.03

0.75

35.4532000

1.0635960
Iron

Fe

0.26

0.02

0.50

55.8452000

1.1169040
Cobalt

Co

12.72

0.91

22.75

58.9332009

53.6292128
Nickel

Ni

0.70

0.05

1.25

58.6934200

2.9346710
Copper

Cu

0.30

0.02

0.50

63.5463000

1.2709260
Antimony

Sb

85.77

2.97

74.25

121.7601000

361.6274970

Analysis wt%

Ø Co : 12.80, Ni : 0.70, Fe : 0.30, Cu : 0.20, Sb : 85.80, Cl : 0.3 (Ref: Canadian Mineralogist 94)

Strunz 9th edition incl. updates

2.EC.05

2: Sulfide und Sulfosalze (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide, Sulfoarsenide, Sulfoantimonide, Sulfobismuthide)
E: Metallsulfide mit M:S >= 1:2
C: M:S = 1:>2
05:Skutterudit-Gruppe

Lapis Classification

II/D.29-025

II: SULFIDE UND SULFOSALZE (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide)
D: Sulfide mit Metall : S,Se,Te < 1:1

Classification by Hölzel

2.EC.110

2: SULFIDES
E: Me/S=1/2 (also < 1/2)
C: Me/S=1/3 With Co,Ni
1: Skutterudite-Group

Dana 8th edition

02.12.17.03

02: Sulfide Minerals
12: Sulfides - Including Selenides and Tellurides where Am Bn Xp, with (m+n):p=1:2
17: Skutterudite Series

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Perovskite supergroup  ⇒ Non-stoichiometric perovskites  ⇒ Skutterudite subgroup

Optical Properties

Color

zinnweiß

Streak color

grau

Diaphaneity (Transparency)

opak

Lustre

hoher Metallglanz

Anisotropism

keine Innenreflexe

Reflectivity: (Lambda nm) ↓, ↑, Ø

(470) , , 59.0
(546) , , 58.7
(589) , , 58.7
(650) , , 58.7
Reflection chart Kieftite

Crystallography

Crystal System

kubisch

Class (H-M)

m3

Space Group number

204

Space Group

Im3

Cell parameters a (Å)

9.041

Cell parameters b (Å)

-

Cell parameters c (Å)

-

Cell parameters a/b or c/a

1

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

8

Volume (ų)

739.008

Crystal structure

kubisch primitives Gitter; isomorph mit Skutterudit

X-Ray Powder Diffraction

2.86(100),
2.42(60),
2.02(80),
1.77(60),
1.55(60),
1.331(70),
1.186(60),
1.052(60)
XRD chart Kieftite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Morphology

Tracht aus {100}, {110} und {111}

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

5.25

VHN (Hardness Vickers)

467 (100g)

Density (g/cm³)

7.2

7.579 ( ρ calc. Mineralienatlas )

Cleavages

keine

Fracture

muschelig

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Schweden/Södermanland, Provinz/Nyköping/Tunaberg

Type material

Instituut voor Aardwetenschappen, Vrije Universiteit, Amsterdam

Preface

Associations

Chalkopyrit, Bornit, Galenit, Wismut, Silber, Dyskrasit, Gudmundit, Tetrahedrit

Name from

Dr. Cornelius Kieft (*1924), Erzmineraloge

Author (Name, Year)

Dobbe & Lustenhouwer & Zakrzewski & Goubitz & Fraanje & Schenk, 1994

References

Canadian Mineralogist 32 (1994), 179

IMA group assignments

 
Perovskite supergroup
 
 
 

 
 
Non-stoichiometric perovskites
 
 
 

 
 
 
Skutterudite subgroup
 
 
 

 
 
 
 
Kieftite
CoSb3
kubisch
Im3

 
 
 
 
Nickelskutterudite
(Ni,Co,Fe)As3
kubisch
Im3

 
 
 
 
Skutterudite
CoAs3
kubisch
Im3

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Actuality: 11. May 2025 - 11:52:32

Other languages

German

Kieftit

Spanish

Kieftita

French

Kieftite

English

Kieftite

Russian

Кифтит

CNMNC (IMA)-Number

IMA 1991-052

CNMNC symbol

Symbol

Kie

Locations with GPS information

IDs

GUSID (Global unique identifier short form) yjeJ8VTLdESlF03TT13KrA
GUID (Global unique identifier) F18937CA-CB54-4474-A517-4DD34F5DCAAC
Database ID 1942