Picotpaulite Mineral Data

Picotpaulite Mineral Data +

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General Picotpaulite Information

Chemical Formula:

TlFe2S3

Composition:

Molecular Weight = 412.28 gm

Thallium 49.57 % Tl

Iron 27.09 % Fe

Sulfur 23.33 % S

______

100.00 %

Empirical Formula:

TlFe²⁺₂S₃

Environment:

Ina hydrothermal ore deposit with other arsenic minerals.

IMA Status:

Approved IMA 1970

Locality:

Allchar, Macedonia. Link to MinDat.org Location Data.

Name Origin:

Named for Paul Picot (1931-), French mineralogist.

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Picotpaulite Crystallography

Axial Ratios:

a:b:c =0.5037:1:0.8432

Cell Dimensions:

a = 5.4, b = 10.72, c = 9.04, Z = 4; V = 523.31 Den(Calc)= 5.23

Crystal System:

Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: C 222

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

By Intensity(I/I_o): 2.912(1), 4.26(0.9), 3.8(0.7),

Physical Properties of Picotpaulite

Color:

Bronze.

Density:

5.2

Diaphaniety:

Opaque

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Hardness:

2 - Gypsum

Luster:

Metallic

Optical Properties of Picotpaulite

RL Anisotrophism:

Strong, in gray-violet tints.

RL Color:

Creamy white.

RL Pleochroism:

Strong.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Picotpaulite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	23.50	28.70
420 nm	24.50	30.30
440 nm	25.50	31.90
460 nm	25.80	32.40
480 nm	25.40	32.00
500 nm	24.60	31.30
520 nm	24.30	31.00
540 nm	24.20	31.00
560 nm	24.40	31.40
580 nm	24.60	32.20
600 nm	25.20	33.10
620 nm	25.70	33.80
640 nm	26.50	34.70
660 nm	27.30	35.60
680 nm	28.20	36.60
700 nm	29.20	37.60

**Calculated Relative Intensity Colors of Picotpaulite in Air**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	320%	360%
R₁
R₂

Calculated Properties of Picotpaulite

Electron Density:

r_electron=4.59 gm/cc
note: r_Picotpaulite=5.23 gm/cc.

Fermion Index

Fermion Index = 0.00749
Boson Index = 0.99251

Photoelectric:

PE_Picotpaulite= 840.76 barns/electron
U=PE_Picotpaulite x r_electron=3,860.95 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Picotpaulite is Not Radioactive

Picotpaulite Classification

Dana Class:

2.9.12.2 (2)Sulfides - Including Selenides and Tellurides

(2.9)where Am Bn Xp, with (m+n):p=1:1

(2.9.12)Dana Group

2.9.12.1 Sternbergite AgFe2S3 C mma 2/m 2/m 2/m

2.9.12.2 Picotpaulite TlFe2S3 C 222 2 2 2

Strunz Class:

II/C.05-20 II - Sulfides and sulphosalts

II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1

II/C.05 - Chalcopyrite group, Raguinite - Picotpaulite series

II/C.05-10 Raguinite TlFeS2 Unk Ortho

II/C.05-20 Picotpaulite TlFe2S3 C 222 2 2 2

Other Picotpaulite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Picotpaulite :
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 -École des Mines de Paris

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

Picotpaulite

TlFe2S3
Dana No: 2.9.12.2 Strunz No: II/C.05-20
Locality:

Notes: