Pierrotite Mineral Data

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.

Synonym:

ICSD 31358

PDF 25-938

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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),

Physical Properties of Pierrotite

Color:

Grayish black.

Density:

4.97

Diaphaniety:

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:

r_electron=4.17 gm/cc
note: r_Pierrotite=4.75 gm/cc.

Fermion Index

Fermion Index = 0.00197
Boson Index = 0.99803

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Pierrotite is Not Radioactive

Pierrotite Classification

Dana Class:

3.8.7.1 (3)Sulfides - Sulfosalts

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

(3.8.7)Dana Group

3.8.7.1 Pierrotite Tl2Sb6As4S16 P na2₁ mm2

Strunz Class:

II/E.14-30 II - Sulfides and sulphosalts

II/E - Sulfosalts (S : As,Sb,Bi = x) Sulfosalts with predominant Thallium and Mercury, x = 4.0 - 1.6

II/E.14 - Rebulite - Chabourneite series

II/E.14-10 Rebulite Tl5Sb5As8S22 P 2₁/c 2/m

II/E.14-12 Jankovicite Tl5Sb9(As,Sb)4S22 P1 1

II/E.14-15 Imhofite Tl6CuAs16S40 P 2₁/n 2/m

II/E.14-20 Bernardite Tl(As,Sb)5S8 P 2₁/c 2/m

II/E.14-25 Gillulyite Tl2(As,Sb)8S13 P 2/n 2/m

II/E.14-30 Pierrotite Tl2Sb6As4S16 P na2₁ mm2

II/E.14-40 Parapierrotite Tl(Sb,As)5S8 P 2₁/n 2/m

II/E.14-50 Chabourneite (Tl,Pb)21(Sb,As)91S147 P1 1

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Pierrotite

Tl2Sb6As4S16
Dana No: 3.8.7.1 Strunz No: II/E.14-30
Locality:

Notes: