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Nukundamite (Nukundamit)

Collectors Summary

Color kupferrot
Streak color dunkelgrau
Hardness (Mohs) 3.5
Crystal System trigonal, P3m1
Morphology kupferrote büschlige xx´

Chemism

Chemical formula

(Cu,Fe)4S4

Chemical composition

Eisen, Kupfer, Schwefel

Unit weight: 374.7461 u; Number of atoms in the formula: 8

Info

Empirical formula:

(Cu0.75Fe0.25)4S4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Sulfur

S

34.23

4

50.00

32.0655000

128.2620000
Iron

Fe

14.90

1

12.50

55.8452000

55.8452000
Copper

Cu

50.87

3

37.50

63.5463000

190.6389000

Analysis wt%

S : 33.51, Fe : 9.64, Cu : 56.51 (Ref: Mineralogical Magazine 79)

Strunz 9th edition incl. updates

2.CA.10

2: Sulfide und Sulfosalze (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide, Sulfarsenite, Sulfantimonite, Sulfbismuthite)
C: Metallsulfide, M : S = 1 : 1 (und ähnliche)
A: mit Kupfer (Cu]
10:Nukundamit-Gruppe

Lapis Classification

II/C.22-040

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

Classification by Hölzel

2.CA.200

2: SULFIDES
C: Sulfides (etc) with Me/S=1/1
A: With Cu Coordination Number ~[3] and ~[4], Layers

Dana 8th edition

02.09.15.01

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

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

kupferrot

Streak color

dunkelgrau

Diaphaneity (Transparency)

opak

Crystallography

Crystal System

trigonal

Class (H-M)

3m

Space Group number

164

Space Group

P3m1

Cell parameters a (Å)

3.782

Cell parameters b (Å)

-

Cell parameters c (Å)

11.187

Cell parameters a/b or c/a

2.958

Cell parameters c/b

-

Z

1

Volumne (ų)

138.576

X-Ray Powder Diffraction

3.732(10),
3.273(30),
3.143(100),
2.826(70),
2.796(40),
1.891(60),
1.847(50),
1.568(20)
XRD chart Nukundamite

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

Morphology

kupferrote büschlige xx´

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

3.5

VHN (Hardness Vickers)

107 (20g)

Density (g/cm³)

4.3

4.49 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Fidschi/Vanua Levu/Nukundamu/Undu mine

Preface

Author (Name, Year)

Rice & Atkin & Bowles & Criddle, 1979

References

Mineralogical Magazine 43 (1979), 193

Other languages

German

Nukundamit

Spanish

Nukundamita

French

Nukundamite

English

Nukundamite

Russian

Нукундамит

CNMNC (IMA)-Number

IMA 1978-037

CNMNC symbol

Symbol

Nuk

Locations with GPS information