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Wittite Mineral Data
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General Wittite Information
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 Chemical Formula: |
Pb3Bi4(S,Se)9 |
| Composition: |
Molecular Weight = 1,886.80 gm |
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Bismuth 44.30 % Bi |
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Lead 32.94 % Pb |
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Selenium 12.55 % Se |
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Sulfur 10.20 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Pb3Bi4S6Se3 |
| Environment: |
Iolite bearing amphibolite. |
| IMA Status: |
Valid Species (Pre-IMA) 1924 |
| Locality: |
Galun, Koperberg, Sweden. Link to MinDat.org Location Data. |
| Name Origin: |
Named for T. Witt, Swedish mining engineer. |
| Name Pronunciation: |
Wittite  |
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Wittite Image |
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Images:
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Wittite Crystallography
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| Axial Ratios: |
a:b:c =1.7671:1:3.799 |
| Cell Dimensions: |
a = 7.21, b = 4.08, c = 15.5, Z = 1; beta = 98.75° V = 450.65 Den(Calc)= 6.95 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/m |
| X Ray Diffraction: |
By Intensity(I/Io): 2.887(1), 2.041(0.7), 3.434(0.7),3.529(0.5), 3.607(0.5), 3.848(0.5), 3.004(0.5), |
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Physical Properties of Wittite
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| Cleavage: |
{???} Good |
| Color: |
Light lead gray. |
| Density: |
7.12 |
| Diaphaneity: |
Opaque |
| Habit: |
Massive - Uniformly indistinguishable crystals forming large masses. |
| Habit: |
Striated - Parallel lines on crystal surface or cleavage face. |
| Hardness: |
2-2.5 - Gypsum-Finger Nail |
| Luster: |
Metallic |
| Streak: |
black |
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Optical Properties of Wittite
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| Optical Data: |
NCalc= 1.85 - from Gladstone-Dale relationship (KC = 0.1228) where Ncalc=Dcalc*KC+1
NCalc= 1.87 - from Gladstone-Dale relationship (KC = 0.1228) where Ncalc=Dmeas*KC+1
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| RL Color: |
Cream-white. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Wittite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
43.20 |
45.30 |
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| 420 nm |
42.80 |
44.90 |
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| 440 nm |
42.40 |
44.50 |
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| 460 nm |
41.90 |
44.20 |
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| 480 nm |
41.50 |
43.80 |
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| 500 nm |
41.10 |
43.30 |
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| 520 nm |
40.50 |
42.80 |
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| 540 nm |
40.00 |
42.30 |
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| 560 nm |
39.40 |
41.80 |
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| 580 nm |
38.90 |
41.30 |
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| 600 nm |
38.40 |
40.90 |
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| 620 nm |
38.00 |
40.60 |
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| 640 nm |
37.70 |
40.40 |
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| 660 nm |
37.40 |
40.20 |
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| 680 nm |
37.30 |
39.80 |
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| 700 nm |
37.20 |
39.70 |
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Calculated Relative Intensity Colors of Wittite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
230% |
| R1 |
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| R2 |
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Calculated Properties of Wittite
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| Electron Density: |
Bulk Density (Electron Density)=5.72 gm/cc
note: Specific Gravity of Wittite =6.95 gm/cc.
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| Fermion Index: |
Fermion Index = 0.08
Boson Index = 0.92 |
| Photoelectric: |
PEWittite =1,492.95 barns/electron
U=PEWittite x rElectron Density=8,534.89 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Wittite is Not Radioactive |
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Wittite Classification
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| Dana Class: |
03.06.05.02 (03)Sulfides - Sulfosalts |
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(03.06)where 2 < z/y < 2.49 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.06.05)Dana Group |
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03.06.05.01 Cannizzarite Pb4Bi6S13 C 2/m 2/m |
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03.06.05.02 Wittite Pb3Bi4(S,Se)9 P 2/m 2/m |
| Strunz Class: |
02.JB.20 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.J - Sulfosalts of PbS Archetype |
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02.JB -Galena derivatives, with Pb |
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02.JB.20 Cannizzarite Pb4Bi6S13 C 2/m 2/m |
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02.JB.20 Wittite Pb3Bi4(S,Se)9 P 2/m 2/m |
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Other Wittite Information
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| References: |
NAME( Ford32) PHYS. PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Wittite :
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 Wittite Specimen Label here :
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Wittite
Pb3Bi4(S,Se)9
Dana No: 03.06.05.02 Strunz No: 02.JB.20
Locality:
Notes:
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