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Balkanite Mineral Data
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General Balkanite Information
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 Chemical Formula: |
Cu9Ag5HgS8 |
| Composition: |
Molecular Weight = 1,568.37 gm |
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Copper 36.47 % Cu |
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Silver 34.39 % Ag |
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Mercury 12.79 % Hg |
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Sulfur 16.36 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Cu9Ag5HgS8 |
| Environment: |
In high grade copper ores in stratiform Pb-Zn-Cu deposits. |
| IMA Status: |
Approved IMA 1973 |
| Locality: |
Sedmochislenitsi mine, Vratsa district, Balkan Mountains, Bulgaria. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Name Pronunciation: |
Balkanite + Pronunciation  |
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Balkanite Image |
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Images:
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Balkanite
Comments: B&W image of a polished section of balkanite with polysynthetic twinning. (AmMin v58:11).
Location: Sedmochislenitsi mine, Vratsa district, in the western part of the Stara Planina, Bulgaria.
Scale: 330 X.
© American Mineralogist |
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Images:
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Balkanite Crystallography
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| Axial Ratios: |
a:b:c =1.1273:1:0.4161 |
| Cell Dimensions: |
a = 10.62, b = 9.42, c = 3.92, Z = 1; V = 392.16 Den(Calc)= 6.64 |
| Crystal System: |
Orthorhombic - Disphenoidal H-M Symbol (2 2 2) Space Group: P 222 ? |
| X Ray Diffraction: |
By Intensity(I/Io): 2.55(1), 2.98(1), 1.955(0.9), |
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Physical Properties of Balkanite
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| Cleavage: |
None |
| Color: |
Gray, Steel gray. |
| Density: |
6.318 |
| Diaphaneity: |
Opaque |
| Habit: |
Microscopic Crystals - Crystals visible only with microscopes. |
| Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
| Hardness: |
3.5 - Copper Penny |
| Luster: |
Metallic |
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Optical Properties of Balkanite
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| RL Color: |
White gray. |
| RL Pleochroism: |
Strong. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Balkanite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 440 nm |
35.40 |
30.60 |
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| 460 nm |
35.60 |
31.00 |
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| 480 nm |
35.40 |
31.00 |
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| 500 nm |
35.00 |
30.20 |
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| 520 nm |
34.00 |
28.90 |
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| 540 nm |
34.00 |
28.00 |
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| 560 nm |
33.40 |
27.20 |
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| 580 nm |
32.80 |
26.50 |
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| 600 nm |
32.40 |
26.00 |
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| 620 nm |
32.10 |
25.60 |
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| 640 nm |
31.80 |
25.10 |
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| 660 nm |
31.50 |
24.90 |
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Calculated Relative Intensity Colors of Balkanite in Air
Relative
Intensity |
0% |
40% |
80% |
100% |
120% |
160% |
200% |
240% |
280% |
320% |
340% |
| R1 |
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| R2 |
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Calculated Properties of Balkanite
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| Electron Density: |
Bulk Density (Electron Density)=5.96 gm/cc
note: Specific Gravity of Balkanite =6.64 gm/cc.
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| Fermion Index: |
Fermion Index = 0.03
Boson Index = 0.97 |
| Photoelectric: |
PEBalkanite = 306.97 barns/electron
U=PEBalkanite x rElectron Density=1,829.83 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Balkanite is Not Radioactive |
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Balkanite Classification
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| Dana Class: |
02.16.07.01 (02)Sulfides - Including Selenides and Tellurides |
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(02.16)with miscellaneous formulae |
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(02.16.07)Dana Group |
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02.16.07.01 Balkanite Cu9Ag5HgS8 P 222 ? 2 2 2 |
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02.16.07.02 Danielsite (Cu,Ag)14HgS8 Unk Ortho |
| Strunz Class: |
02.BD.15 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1) |
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02.BD -With Hg, Tl |
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02.BD.15 Balkanite Cu9Ag5HgS8 P 222 ? 2 2 2 |
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02.BD.15 Danielsite (Cu,Ag)14HgS8 Unk Ortho |
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Other Balkanite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Balkanite :
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
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Print or Cut-and-Paste your Balkanite Specimen Label here :
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Balkanite
Cu9Ag5HgS8
Dana No: 02.16.07.01 Strunz No: 02.BD.15
Locality:
Notes:
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