Cernyite Mineral Data

General Cernyite Information

Chemical Formula:

Cu2CdSnS4

Composition:

Molecular Weight = 486.48 gm

Cadmium 23.11 % Cd

Copper 26.12 % Cu

Tin 24.40 % Sn

Sulfur 26.37 % S

______

100.00 %

Empirical Formula:

Cu₂CdSnS₄

Environment:

A rare constituent of complex zoned pegmatites, as a component of a very minor sulfide mineral suite.

IMA Status:

Approved IMA 1978

Locality:

In the Hugo pegmatite, 1.6 km south of Keystone. Link to MinDat.org Location Data.

Name Origin:

For Dr. Cerny, mineralogist at the University of Manitoba, Winnipeg, Canada.

Synonym:

ICSD 200421

IMA1976-057

PDF 29-537

Cernyite Image

Images:

Cernyite

Comments: Gray massive, metallic cernyite.
Location: Hugo Mine, Keystone, Keystone District, Pennington County, South Dakota, USA. Scale: See Image.
© Rruff Database

Cernyite Crystallography

Axial Ratios:

a:c = 1:1.95673

Cell Dimensions:

a = 5.533, c = 10.8266, Z = 2; V = 331.45 Den(Calc)= 4.87

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): 3.167(1), 1.939(0.7), 1.662(0.5),

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

Szymanski J T , The Canadian Mineralogist , 16 (1978) p.147-151, The crystal structure of cernyite, Cu2CdSnS4, a cadmium analogue of stannite, Note: z-coordinate for S atom changed in order to reproduce bond lengths.

Physical Properties of Cernyite

Cleavage:

None

Color:

Gray, Steel gray.

Density:

4.776

Diaphaneity:

Opaque

Hardness:

4 - Fluorite

Luster:

Metallic

Streak:

black

Optical Properties of Cernyite

RL Anisotrophism:

Very weak in shades of gray.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Cernyite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
470 nm	24.60	25.50
546 nm	23.40	25.60
589 nm	22.30	25.00
650 nm	22.70	24.30

**Calculated Relative Intensity Colors of Cernyite in Air**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	320%	360%	390%
R₁
R₂

Calculated Properties of Cernyite

Electron Density:

Bulk Density (Electron Density)=4.40 gm/cc
note: Specific Gravity of Cernyite =4.87 gm/cc.

Fermion Index:

Fermion Index = 0.1
Boson Index = 0.9

Photoelectric:

PE_Cernyite= 149.51 barns/electron
U=PE_Cernyite x rElectron Density= 658.54 barns/cc.

Radioactivity:

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

Cernyite Classification

Dana Class:

02.09.02.02 (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 Cernyite Information

References:

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

See Also:

Links to other databases for Cernyite :
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 Cernyite Specimen Label here :

Cernyite

Cu2CdSnS4
Dana No: 02.09.02.02 Strunz No: 02.CB.15a
Locality:

Notes: