Velikite Mineral Data

Velikite Mineral Data +

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General Velikite Information

Chemical Formula:

Cu2HgSnS4

Composition:

Molecular Weight = 574.66 gm

Copper 22.12 % Cu

Tin 20.66 % Sn

Mercury 34.91 % Hg

Sulfur 22.32 % S

______

100.00 %

Empirical Formula:

Cu₂HgSnS₄

Environment:

In veins cutting carboniferous black schists and limestones in a mercury deposit. The mercury dominant analog of cernyite and stannite.

IMA Status:

Approved IMA 1977

Locality:

Khaidarkan Hg deposit, about 60 km south of Fergana, Kirgizia. Link to MinDat.org Location Data.

Name Origin:

For A. C. Velikyi (1913-1970), a well known investigator of the ore deposits of Central Asia.

Synonym:

ICSD 27746

IMA1996-052

PDF 45-1420

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Velikite Crystallography

Axial Ratios:

a:c = 1:1.96417

Cell Dimensions:

a = 5.555, c = 10.911, Z = 2; V = 336.69 Den(Calc)= 5.67

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): 3.17(1), 1.941(0.8), 1.671(0.4),

Physical Properties of Velikite

Cleavage:

None

Color:

Gray, Greenish gray, Light gray.

Density:

5.45

Diaphaniety:

Opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

4 - Fluorite

Luster:

Metallic

Streak:

gray

Optical Properties of Velikite

RL Anisotrophism:

Moderate.

RL Bireflectance:

Insignificant.

RL Color:

Greenish gray to light gray with greenish-brownish tint.

RL Pleochroism:

Weak.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Velikite in Air**
λ	R	∑ R(λ)
470 nm	26.00
546 nm	26.30
589 nm	25.60
650 nm	24.80

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

Calculated Properties of Velikite

Electron Density:

r_electron=4.97 gm/cc
note: r_Velikite=5.67 gm/cc.

Fermion Index

Fermion Index = 0.14142
Boson Index = 0.85858

Photoelectric:

PE_Velikite= 640.11 barns/electron
U=PE_Velikite x r_electron=3,183.16 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Velikite is Not Radioactive

Velikite Classification

Dana Class:

2.9.2.8 (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.06-100 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 Velikite Information

References:

NAME( MinRec) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(MinRec, v 29, p 478)

See Also:

Links to other databases for Velikite :
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

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

Velikite

Cu2HgSnS4
Dana No: 2.9.2.8 Strunz No: II/C.06-100
Locality:

Notes: