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Velikite Mineral Data
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General Velikite Information
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 Chemical Formula: |
Cu2HgSnS4 |
| Composition: |
Molecular Weight = 574.66 gm |
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Copper 22.12 % Cu |
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Tin 20.66 % Sn |
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Mercury 34.91 % Hg |
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Sulfur 22.32 % S |
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______ |
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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. |
| Name Pronunciation: |
Velikite  |
| Synonym: |
ICSD 27746 |
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IMA1996-052 |
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PDF 45-1420 |
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Velikite Crystallography
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| 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 - Scalenohedral H-M Symbol (4 2m) Space Group: I 42m |
| X Ray Diffraction: |
By Intensity(I/Io): 3.17(1), 1.941(0.8), 1.671(0.4), |
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Physical Properties of Velikite
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| Cleavage: |
None |
| Color: |
Gray, Greenish gray, Light gray. |
| Density: |
5.45 |
| Diaphaneity: |
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 |
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Optical Properties of Velikite
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| 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 |
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∑ R(λ) |
| 470 nm |
26.00 |
 |
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| 546 nm |
26.30 |
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| 589 nm |
25.60 |
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| 650 nm |
24.80 |
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Calculated Relative Intensity Colors of Velikite in Air
Relative
Intensity |
0% |
40% |
80% |
100% |
120% |
160% |
200% |
240% |
280% |
320% |
350% |
| R |
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Calculated Properties of Velikite
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| Electron Density: |
Bulk Density (Electron Density)=4.97 gm/cc
note: Specific Gravity of Velikite =5.67 gm/cc.
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| Fermion Index: |
Fermion Index = 0.14
Boson Index = 0.86 |
| Photoelectric: |
PEVelikite = 640.11 barns/electron
U=PEVelikite x rElectron Density=3,183.16 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Velikite is Not Radioactive |
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Velikite Classification
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| Dana Class: |
02.09.02.08 (02)Sulfides - Including Selenides and Tellurides |
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(02.09)where Am Bn Xp, with (m+n):p=1:1 |
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(02.09.02)Stannite Group (Tetragonal: I-42m) A2BCS type |
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02.09.02.01 Stannite Cu2FeSnS4 I 42m 4 2m |
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02.09.02.02 Cernyite Cu2CdSnS4 I 42m 4 2m |
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02.09.02.03 Briartite Cu2(Zn,Fe)GeS4 I 42m 4 2m |
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02.09.02.04 Kuramite Cu3SnS4 I 42m 4 2m |
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02.09.02.05 Sakuraiite (Cu,Zn,Fe,In,Sn)4S4 P 432, P 43m, or P m3m Cubic |
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02.09.02.06 Hocartite Ag2FeSnS4 I 42m 4 2m |
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02.09.02.07 Pirquitasite Ag2ZnSnS4 I 42m 4 2m |
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02.09.02.08 Velikite Cu2HgSnS4 I 42m 4 2m |
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02.09.02.09 Kesterite Cu2(Zn,Fe)SnS4 I 4 4 |
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02.09.02.10 Ferrokesterite Cu2(Fe,Zn)SnS4 I 42m 4 2m |
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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 |
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02.C - Metal Sulfides, M:S = 1:1 (and similar) |
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02.CB -With Zn, Fe, Cu, Ag, Au, etc |
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02.CB.15a Cernyite Cu2CdSnS4 I 42m 4 2m |
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02.CB.15a Ferrokesterite Cu2(Fe,Zn)SnS4 I 42m 4 2m |
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02.CB.15a Kesterite Cu2(Zn,Fe)SnS4 I 4 4 |
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02.CB.15a Hocartite Ag2FeSnS4 I 42m 4 2m |
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02.CB.15a Idaite Cu5FeS6 P 63/mmc 6/m 2/m 2/m |
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02.CB.15a Kuramite Cu3SnS4 I 42m 4 2m |
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02.CB.15a Pirquitasite Ag2ZnSnS4 I 42m 4 2m |
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02.CB.15a Stannite Cu2FeSnS4 I 42m 4 2m |
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02.CB.15a Velikite Cu2HgSnS4 I 42m 4 2m |
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Other Velikite Information
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| 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 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - WWW-MINCRYST
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Print or Cut-and-Paste your Velikite Specimen Label here :
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Velikite
Cu2HgSnS4
Dana No: 02.09.02.08 Strunz No: 02.CB.15a
Locality:
Notes:
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