Isocubanite Mineral Data

Isocubanite Mineral Data +

General Isocubanite Information

Chemical Formula:

CuFe2S3

Composition:

Molecular Weight = 271.44 gm

Iron 41.15 % Fe

Copper 23.41 % Cu

Sulfur 35.44 % S

______

100.00 %

Empirical Formula:

CuFe²⁺₂S₃

Environment:

Primary sulfide precipitate from hot, saline solutions that cool under seawater.

IMA Status:

Approved IMA 1988

Locality:

Submarine "black smokers", East Pacific Rise and Red Sea. Link to MinDat.org Location Data.

Name Origin:

Named as the isometric polymorph of cubanite.

Synonym:

ICSD 42105

PDF 27-166

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Isocubanite Crystallography

Cell Dimensions:

a = 5.303, Z = 1.333; V = 149.13 Den(Calc)= 4.03

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): 3.059(1), 1.876(0.7), 1.602(0.5),

Physical Properties of Isocubanite

Color:

Bronze.

Density:

3.925

Diaphaniety:

Opaque

Hardness:

3.5 - Copper Penny

Luster:

Metallic

Optical Properties of Isocubanite

RL Color:

Pinkish brown, similar to bornite.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Isocubanite in Air**
λ	R	∑ R(λ)
420 nm	22.70
440 nm	24.60
460 nm	26.90
480 nm	29.20
500 nm	31.30
520 nm	33.20
540 nm	34.50
560 nm	36.20
580 nm	37.40
600 nm	38.20
620 nm	39.10
640 nm	39.70
660 nm	40.30
680 nm	40.90
700 nm	41.30

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

Calculated Properties of Isocubanite

Electron Density:

r_electron=3.83 gm/cc
note: r_Isocubanite=4.03 gm/cc.

Fermion Index

Fermion Index = 0.01138
Boson Index = 0.98862

Photoelectric:

PE_Isocubanite= 24.86 barns/electron
U=PE_Isocubanite x r_electron= 95.22 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Isocubanite is Not Radioactive

Isocubanite Classification

Dana Class:

2.9.13.3 (2)Sulfides - Including Selenides and Tellurides

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

(2.9.13)Dana Group

2.9.13.1 Cubanite CuFe2S3 Pcmn 2/m 2/m 2/m

2.9.13.2 Argentopyrite AgFe2S3 Pmmn 2/m 2/m 2/m

2.9.13.3 Isocubanite CuFe2S3 F m3m 4/m 3 2/m

Strunz Class:

II/C.04-50 II - Sulfides and sulphosalts

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

II/C.04 - Chalcopyrite group, Mooihoekite - Orickite series

II/C.04-10 Mooihoekite Cu9Fe9S16 P 4₂m- 4 2m

II/C.04-20 Haycockite Cu4Fe5S8 P 222 2 2 2

II/C.04-30 Putoranite Cu1.1Fe1.2S2 P n3n 4/m 3 2/m

II/C.04-35 Isochalcopyrite* Cu8Fe9S16 Unk Cubic

II/C.04-40 Talnakhite Cu9(Fe,Ni)8S16 I 43m 4 3m

II/C.04-50 Isocubanite CuFe2S3 F m3m 4/m 3 2/m

II/C.04-60 Orickite CuFeS2·(H2O) Unk Hex

Other Isocubanite Information

References:

NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.74,p503,1989) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Isocubanite :
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 -École des Mines de Paris

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Print or Cut-and-Paste your Isocubanite Specimen Label here :

Isocubanite

CuFe2S3
Dana No: 2.9.13.3 Strunz No: II/C.04-50
Locality:

Notes: