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.

Name Pronunciation:

Kuramite

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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),

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

Chen X , Wada H , Sato A , Mieno M , Journal of Solid State Chemistry , 139 (1998) p.144-151, Synthesis, electrical conductivity, and crystal structure of Cu4Sn7S16 and, structure refinement of Cu2SnS3, Locality: synthetic

Physical Properties of Kuramite

Color:

Gray, Steel gray.

Density:

4.56

Diaphaneity:

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:

Bulk Density (Electron Density)=4.19 gm/cc
note: Specific Gravity of Kuramite =4.56 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_Kuramite= 102.91 barns/electron
U=PE_Kuramite x rElectron Density= 431.07 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Kuramite is Not Radioactive

Kuramite Classification

Dana Class:

02.09.02.04 (02)Sulfides - Including Selenides and Tellurides

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

(02.09.02)Stannite Group (Tetragonal: I-42m) A2BCS type

02.09.02.01 Stannite Cu2FeSnS4 I 42m 4 2m

02.09.02.02 Cernyite Cu2CdSnS4 I 42m 4 2m

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

02.09.02.04 Kuramite Cu3SnS4 I 42m 4 2m

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

02.09.02.06 Hocartite Ag2FeSnS4 I 42m 4 2m

02.09.02.07 Pirquitasite Ag2ZnSnS4 I 42m 4 2m

02.09.02.08 Velikite Cu2HgSnS4 I 42m 4 2m

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

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

02.09.02.11 Barquillite! Cu2CdGeS4 I 42m 4 2m

Strunz Class:

02.CB.15a 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.C - Metal Sulfides, M:S = 1:1 (and similar)

02.CB -With Zn, Fe, Cu, Ag, Au, etc

02.CB.15a Cernyite Cu2CdSnS4 I 42m 4 2m

02.CB.15a Ferrokesterite Cu2(Fe,Zn)SnS4 I 42m 4 2m

02.CB.15a Kesterite Cu2(Zn,Fe)SnS4 I 4 4

02.CB.15a Hocartite Ag2FeSnS4 I 42m 4 2m

02.CB.15a Idaite Cu5FeS6 P 6₃/mmc 6/m 2/m 2/m

02.CB.15a Kuramite Cu3SnS4 I 42m 4 2m

02.CB.15a Pirquitasite Ag2ZnSnS4 I 42m 4 2m

02.CB.15a Stannite Cu2FeSnS4 I 42m 4 2m

02.CB.15a Velikite Cu2HgSnS4 I 42m 4 2m

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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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

Kuramite

Cu3SnS4
Dana No: 02.09.02.04 Strunz No: 02.CB.15a
Locality:

Notes: