Cernyite Mineral Data

Cernyite Mineral Data

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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

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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:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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H - Help Screen
I - Data Info
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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

Diaphaniety:

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:

r_electron=4.40 gm/cc
note: r_Cernyite=4.87 gm/cc.

Fermion Index

Fermion Index = 0.10037
Boson Index = 0.89963

Photoelectric:

PE_Cernyite= 149.51 barns/electron
U=PE_Cernyite x r_electron= 658.54 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Cernyite is Not Radioactive

Cernyite Classification

Dana Class:

2.9.2.2 (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.06-90 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 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 -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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Cernyite

Cu2CdSnS4
Dana No: 2.9.2.2 Strunz No: II/C.06-90
Locality:

Notes: