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Pierrotite Mineral Data
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General Pierrotite Information
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 Chemical Formula: |
Tl2Sb6As4S16 |
| Composition: |
Molecular Weight = 1,952.01 gm |
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Thallium 20.94 % Tl |
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Antimony 37.42 % Sb |
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Arsenic 15.35 % As |
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Sulfur 26.28 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Tl2Sb6As4S16 |
| Environment: |
In quartz veins. |
| IMA Status: |
Approved IMA 1970 |
| Locality: |
Jas Roux, Hautes-Alpes, France. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Roland Pierrot (1930-), French mineralogist. |
| Name Pronunciation: |
Pierrotite + Pronunciation  |
| Synonym: |
ICSD 31358 |
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PDF 25-938 |
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Pierrotite Image |
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Images:
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Pierrotite
Comments: Orange-red micro crystals of pierrotite to 0.2 mm..
Location: Jas Roux, Hautes-Alpes, Provence-Alpes-CÃīte d'Azur, France.
Scale: Sample Size 1x2 cm.
© Tom Loomis / Dakota Matrix |
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Pierrotite Crystallography
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| Axial Ratios: |
a:b:c =4.3949:1:0.9061 |
| Cell Dimensions: |
a = 38.746, b = 8.816, c = 7.989, Z = 4; V = 2,728.92 Den(Calc)= 4.75 |
| Crystal System: |
Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: P na21 |
| X Ray Diffraction: |
By Intensity(I/Io): 3.59(1), 2.7(0.9), 3.49(0.9), |
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Physical Properties of Pierrotite
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| Color: |
Grayish black. |
| Density: |
4.97 |
| Diaphaneity: |
Opaque |
| Habit: |
Aggregates - Made of numerous individual crystals or clusters. |
| Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. |
| Hardness: |
3.5 - Copper Penny |
| Luster: |
Metallic |
| Streak: |
reddish black |
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Optical Properties of Pierrotite
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| RL Anisotrophism: |
Moderate. |
| RL Color: |
White, with red internal reflections, dark red in transmitted light. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Pierrotite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
35.90 |
39.60 |
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| 420 nm |
35.20 |
38.80 |
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| 440 nm |
34.50 |
38.00 |
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| 460 nm |
33.70 |
37.20 |
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| 480 nm |
33.10 |
36.60 |
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| 500 nm |
32.50 |
36.00 |
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| 520 nm |
31.90 |
35.50 |
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| 540 nm |
31.30 |
35.00 |
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| 560 nm |
30.70 |
34.50 |
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| 580 nm |
30.20 |
34.00 |
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| 600 nm |
29.70 |
33.40 |
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| 620 nm |
29.10 |
32.80 |
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| 640 nm |
28.60 |
32.10 |
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| 660 nm |
28.00 |
31.50 |
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| 680 nm |
27.40 |
30.90 |
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| 700 nm |
26.70 |
30.30 |
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Calculated Relative Intensity Colors of Pierrotite in Air
Relative
Intensity |
0% |
40% |
80% |
100% |
120% |
160% |
200% |
240% |
280% |
300% |
| R1 |
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| R2 |
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Calculated Properties of Pierrotite
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| Electron Density: |
Bulk Density (Electron Density)=4.17 gm/cc
note: Specific Gravity of Pierrotite =4.75 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0019712614
Boson Index = 0.9980287386 |
| Photoelectric: |
PEPierrotite = 489.53 barns/electron
U=PEPierrotite x rElectron Density=2,039.35 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pierrotite is Not Radioactive |
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Pierrotite Classification
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| Dana Class: |
03.08.07.01 (03)Sulfides - Sulfosalts |
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(03.08)where 1 < z/y <2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.08.07)Dana Group |
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03.08.07.01 Pierrotite Tl2Sb6As4S16 P na21 mm2 |
| Strunz Class: |
02.HC.05f 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.H - Sulfosalts of SnS Archetype |
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02.HC -With only Pb |
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02.HC.05f Parapierrotite Tl(Sb,As)5S8 P 21/n 2/m |
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02.HC.05f Pierrotite Tl2Sb6As4S16 P na21 mm2 |
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Other Pierrotite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Pierrotite :
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
15 - WWW-MINCRYST
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Print or Cut-and-Paste your Pierrotite Specimen Label here :
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Pierrotite
Tl2Sb6As4S16
Dana No: 03.08.07.01 Strunz No: 02.HC.05f
Locality:
Notes:
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