Pierrotite Mineral Data

General Pierrotite Information

Chemical Formula:

Tl2Sb6As4S16

Composition:

Molecular Weight = 1,952.01 gm

Thallium 20.94 % Tl

Antimony 37.42 % Sb

Arsenic 15.35 % As

Sulfur 26.28 % S

______

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

PDF 25-938

Pierrotite Image

Images:

Pierrotite

Comments: Orange-red micro crystals of pierrotite to 0.2 mm..
Location: Jas Roux, Hautes-Alpes, Provence-Alpes-CÃ´te d'Azur, France. Scale: Sample Size 1x2 cm.
© Tom Loomis / Dakota Matrix

Pierrotite Crystallography

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 - PyramidalH-M Symbol (mm2) Space Group: P na2₁

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.59(1), 2.7(0.9), 3.49(0.9),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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H - Help Screen
I - Data Info
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Engel P , Gostojic M , Nowacki W , Zeitschrift fur Kristallographie , 165 (1983) p.209-215, The crystal structure of pierrotite, Tl2(Sb,As)10S16, Locality: Jas-Roux, Hutes-Alps, France

Physical Properties of Pierrotite

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

Optical Properties of Pierrotite

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	∑ R₁(λ)	∑ R₂(λ)
400 nm	35.90	39.60
420 nm	35.20	38.80
440 nm	34.50	38.00
460 nm	33.70	37.20
480 nm	33.10	36.60
500 nm	32.50	36.00
520 nm	31.90	35.50
540 nm	31.30	35.00
560 nm	30.70	34.50
580 nm	30.20	34.00
600 nm	29.70	33.40
620 nm	29.10	32.80
640 nm	28.60	32.10
660 nm	28.00	31.50
680 nm	27.40	30.90
700 nm	26.70	30.30

**Calculated Relative Intensity Colors of Pierrotite in Air**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	300%
R₁
R₂

Calculated Properties of Pierrotite

Electron Density:

Bulk Density (Electron Density)=4.17 gm/cc
note: Specific Gravity of Pierrotite =4.75 gm/cc.

Fermion Index:

Fermion Index = 0.0019712614
Boson Index = 0.9980287386

Photoelectric:

PE_Pierrotite= 489.53 barns/electron
U=PE_Pierrotite x rElectron Density=2,039.35 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pierrotite is Not Radioactive

Pierrotite Classification

Dana Class:

03.08.07.01 (03)Sulfides - Sulfosalts

(03.08)where 1 < z/y <2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(03.08.07)Dana Group

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

02.H - Sulfosalts of SnS Archetype

02.HC -With only Pb

02.HC.05f Parapierrotite Tl(Sb,As)5S8 P 2₁/n 2/m

02.HC.05f Pierrotite Tl2Sb6As4S16 P na2₁ mm2

Other Pierrotite Information

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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Ask about Pierrotite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Pierrotite

Tl2Sb6As4S16
Dana No: 03.08.07.01 Strunz No: 02.HC.05f
Locality:

Notes: