Kuramite Mineral Data

Kuramite Mineral Data +

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General Kuramite Information

Chemical Formula:

Cu3SnS4

Composition:

Molecular Weight = 437.61 gm

Copper 43.56 % Cu

Tin 27.13 % Sn

Sulfur 29.31 % S

______

100.00 %

Empirical Formula:

Cu₃SnS₄

Environment:

In gold-sulfide-quartz veins, as inclusions in goldfieldite.

IMA Status:

Approved IMA 1979

Locality:

Kochbulak Au-Ag-Te deposit, Chatkal-Kuraminskii (Kuramin) Mountains, Angren Region, Tashkent District, Uzbekistan. Link to MinDat.org Location Data.

Name Origin:

Name for the locality.

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Kuramite Crystallography

Axial Ratios:

a:c = 1:1.97428

Cell Dimensions:

a = 5.445, c = 10.75, Z = 2; V = 318.72 Den(Calc)= 4.56

Crystal System:

Tetragonal - ScalenohedralH-M Symbol (4 2m) Space Group: I 42m

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

By Intensity(I/I_o): 3.13(1), 1.914(0.8), 1.64(0.6),

Physical Properties of Kuramite

Color:

Gray, Steel gray.

Density:

4.56

Diaphaniety:

Opaque

Habit:

Inclusions - Generally found as inclusions in other minerals.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

5 - Apatite

Luster:

Metallic

Optical Properties of Kuramite

RL Anisotrophism:

Distinct, in shades of brown.

RL Color:

Neutral gray.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Kuramite in Air**
λ	R	∑ R(λ)
440 nm	25.20
460 nm	25.30
480 nm	25.50
500 nm	26.00
520 nm	26.30
540 nm	26.50
560 nm	26.60
580 nm	26.70
600 nm	26.80
620 nm	26.70
640 nm	26.50
660 nm	26.40
680 nm	26.40
700 nm	26.30

**Calculated Relative Intensity Colors of Kuramite in Air**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	320%	350%
R

Calculated Properties of Kuramite

Electron Density:

r_electron=4.19 gm/cc
note: r_Kuramite=4.56 gm/cc.

Fermion Index

Fermion Index = 0.04728
Boson Index = 0.95272

Photoelectric:

PE_Kuramite= 102.91 barns/electron
U=PE_Kuramite x r_electron= 431.07 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Kuramite is Not Radioactive

Kuramite Classification

Dana Class:

2.9.2.4 (2)Sulfides - Including Selenides and Tellurides

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

(2.9.2)Stannite Group (Tetragonal: I4¯2m) A2BCS type

2.9.2.1 Stannite Cu2FeSnS4 I 42m 4 2m

2.9.2.2 Cernyite Cu2CdSnS4 I 42m 4 2m

2.9.2.3 Briartite Cu2(Zn,Fe)GeS4 I 42m 4 2m

2.9.2.4 Kuramite Cu3SnS4 I 42m 4 2m

2.9.2.5 Sakuraiite (Cu,Zn,Fe,In,Sn)4S4 P 4₃2, P 43m, or P m3m Cubic

2.9.2.6 Hocartite Ag2FeSnS4 I 42m 4 2m

2.9.2.7 Pirquitasite Ag2ZnSnS4 I 42m 4 2m

2.9.2.8 Velikite Cu2HgSnS4 I 42m 4 2m

2.9.2.9 Kesterite Cu2(Zn,Fe)SnS4 I 4 4

2.9.2.10 Ferrokesterite Cu2(Fe,Zn)SnS4 I 42m 4 2m

2.9.2.11 Barquillite! Cu2CdGeS4 I 42m 4 2m

Strunz Class:

II/C.06-50 II - Sulfides and sulphosalts

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

II/C.06 - Stannite group

II/C.06-10 Luzonite Cu3AsS4 I 42m 4 2m

II/C.06-20 Famatinite Cu3SbS4 I 42m 4 2m

II/C.06-30 Permingeatite Cu3SbSe4 I 42m 4 2m

II/C.06-40 Briartite Cu2(Zn,Fe)GeS4 I 42m 4 2m

II/C.06-45 Barquillite! Cu2CdGeS4 I 42m 4 2m

II/C.06-50 Kuramite Cu3SnS4 I 42m 4 2m

II/C.06-60 Stannite Cu2FeSnS4 I 42m 4 2m

II/C.06-70 Ferrokesterite Cu2(Fe,Zn)SnS4 I 42m 4 2m

II/C.06-80 Kesterite Cu2(Zn,Fe)SnS4 I 4 4

II/C.06-90 Cernyite Cu2CdSnS4 I 42m 4 2m

II/C.06-100 Velikite Cu2HgSnS4 I 42m 4 2m

II/C.06-110 Hocartite Ag2FeSnS4 I 42m 4 2m

II/C.06-120 Pirquitasite Ag2ZnSnS4 I 42m 4 2m

II/C.06-130 Sakuraiite (Cu,Zn,Fe,In,Sn)4S4 P 4₃2, P 43m, or P m3m Cubic

II/C.06-140 Petrukite (Cu,Fe,Zn)2(Sn,In)S4 P mn2₁ mm2

II/C.06-150 Rhodostannite Cu2FeSn3S8 I 4₁/a 4/m

II/C.06-160 Toyohaite Ag2FeSn3S8 I 4₁/a 4/m

Other Kuramite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Kuramite :
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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Print or Cut-and-Paste your Kuramite Specimen Label here :

Kuramite

Cu3SnS4
Dana No: 2.9.2.4 Strunz No: II/C.06-50
Locality:

Notes: