Nukundamite Mineral Data

Nukundamite Mineral Data +

General Nukundamite Information

Chemical Formula:

(Cu,Fe)4S4

Composition:

Molecular Weight = 367.05 gm

Iron 30.43 % Fe

Copper 34.63 % Cu

Sulfur 34.94 % S

______

100.00 %

Empirical Formula:

Cu₂Fe²⁺₂S₄

Environment:

As a primary mineral in a Kuroko-type deposit, also found as an alteration product of chalcopyrite.

IMA Status:

Approved IMA 1979

Locality:

Undu mine, Nukundamu, Fiji. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 100727

PDF 16-159

Nukundamite Image

Images:

Nukundamite Covellite

Comments: Metallic brownish rim of nukundamite with dark purplish-blue covellite on fine-grained pyrite.
Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Picture size 7 mm.
© Thomas Witzke / Abraxas-Verlag

Nukundamite Crystallography

Axial Ratios:

a:c = 1:2.95795

Cell Dimensions:

a = 3.782, c = 11.187, Z = 1; V = 138.58 Den(Calc)= 4.40

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: P 3m1

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

By Intensity(I/I_o): 3.143(1), 2.826(0.7), 1.891(0.6),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Sugaki A , Shima H , Kitakaze A , Mizota T , American Mineralogist , 66 (1981) p.398-402, Hydrothermal synthesis of nukundamite and its crystal structure

Physical Properties of Nukundamite

Cleavage:

[0001] Perfect

Color:

Copper red.

Density:

4.3

Diaphaniety:

Opaque

Habit:

Hexagonal - Six-sided crystal shape in cross-section or habit.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

3.5 - Copper Penny

Luster:

Metallic

Streak:

dark gray

Optical Properties of Nukundamite

RL Anisotrophism:

Very strong, in pale green-gray colors.

RL Pleochroism:

Strong, from reddish orange to pale gray.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Nukundamite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	15.40	23.80
420 nm	14.90	23.80
440 nm	14.30	23.80
460 nm	14.10	23.60
480 nm	14.00	23.70
500 nm	14.10	23.70
520 nm	14.70	23.70
540 nm	15.80	23.70
560 nm	17.10	23.80
580 nm	18.70	23.90
600 nm	20.40	24.00
620 nm	22.10	24.70
640 nm	24.00	26.10
660 nm	25.70	27.90
680 nm	27.20	30.00
700 nm	28.70	30.20

**Calculated Relative Intensity Colors of Nukundamite in Air**
Relative Intensity	0%	70%	100%	140%	210%	280%	350%	420%	490%	560%	610%
R₁
R₂

Calculated Properties of Nukundamite

Electron Density:

r_electron=4.17 gm/cc
note: r_Nukundamite=4.40 gm/cc.

Fermion Index

Fermion Index = 0.00907
Boson Index = 0.99093

Photoelectric:

PE_Nukundamite= 26.59 barns/electron
U=PE_Nukundamite x r_electron= 110.92 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Nukundamite is Not Radioactive

Nukundamite Classification

Dana Class:

2.9.15.1 (2)Sulfides - Including Selenides and Tellurides

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

(2.9.15)Dana Group

2.9.15.1 Nukundamite (Cu,Fe)4S4 P 3m1 3 2/m

Strunz Class:

II/C.22-40 II - Sulfides and sulphosalts

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

II/C.22 - Covellite series

II/C.22-10 Covellite CuS P 6₃/mmc 6/m 2/m 2/m

II/C.22-20 Klockmannite CuSe P 6₃/mmc 6/m 2/m 2/m

II/C.22-30 Idaite Cu5FeS6 P 6₃/mmc 6/m 2/m 2/m

II/C.22-40 Nukundamite (Cu,Fe)4S4 P 3m1 3 2/m

Other Nukundamite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Nukundamite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Nukundamite

(Cu,Fe)4S4
Dana No: 2.9.15.1 Strunz No: II/C.22-40
Locality:

Notes: