Parapierrotite Mineral Data

Parapierrotite Mineral Data +

General Parapierrotite Information

Chemical Formula:

Tl(Sb,As)5S8

Composition:

Molecular Weight = 1,041.56 gm

Thallium 19.62 % Tl

Antimony 51.43 % Sb

Arsenic 4.32 % As

Sulfur 24.63 % S

______

100.00 %

Empirical Formula:

TlSb_4.4As_0.6S₈

Environment:

Hydrothermal origin, in cavities in realgar.

IMA Status:

Approved IMA 1975

Locality:

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

Name Origin:

Named for its relationship to pierrotite.

Synonym:

ICSD 100291

PDF 29-1330

Parapierrotite Image

Images:

Parapierrotite

Comments: Silvery metallic prismatic parapierrotite grains in translucent quartz rock.
Location: Lookout Pass, Tooele County, Utah, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Parapierrotite Crystallography

Axial Ratios:

a:b:c =0.4144:1:0.4666

Cell Dimensions:

a = 8.02, b = 19.35, c = 9.03, Z = 4; beta = 91.967° V = 1,400.51 Den(Calc)= 4.94

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

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

By Intensity(I/I_o): 2.832(1), 3.493(1), 4.15(0.9),

Forms:

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Crystal Structure:

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Engel P , Zeitschrift fur Kristallographie , 151 (1980) p.203-216, Die kristallstruktur von synthetischem parapierrotit, TlSb5S8, Locality: synthetic

Physical Properties of Parapierrotite

Cleavage:

None

Color:

Black.

Density:

5.04

Diaphaniety:

Opaque

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Sub Metallic

Streak:

gray

Optical Properties of Parapierrotite

RL Anisotrophism:

Distinct, brownish gray to bluish gray.

RL Color:

White with a creamy tint with rare purple-red internal reflections.

RL Pleochroism:

Weak in air , grayish white to brownish gray in oil.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Parapierrotite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	31.70	42.80
420 nm	31.30	42.20
440 nm	30.90	41.60
460 nm	30.30	41.10
480 nm	29.90	40.60
500 nm	29.50	40.30
520 nm	29.30	40.00
540 nm	29.10	39.70
560 nm	28.80	39.20
580 nm	28.60	38.50
600 nm	28.20	37.90
620 nm	27.90	37.10
640 nm	27.30	36.10
660 nm	26.70	35.10
680 nm	26.00	34.10
700 nm	26.60	34.20

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

Calculated Properties of Parapierrotite

Electron Density:

r_electron=4.30 gm/cc
note: r_{Parapierrotite}=4.94 gm/cc.

Fermion Index

Fermion Index = 0.00184
Boson Index = 0.99816

Photoelectric:

PE_{Parapierrotite}= 510.13 barns/electron
U=PE_{Parapierrotite} x r_electron=2,193.00 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Parapierrotite is Not Radioactive

Parapierrotite Classification

Dana Class:

3.8.14.1 (3)Sulfides - Sulfosalts

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

(3.8.14)Dana Group

3.8.14.1 Parapierrotite Tl(Sb,As)5S8 P 2₁/n 2/m

3.8.14.2 Bernardite Tl(As,Sb)5S8 P 2₁/c 2/m

Strunz Class:

II/E.14-40 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 Parapierrotite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Parapierrotite :
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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Parapierrotite

Tl(Sb,As)5S8
Dana No: 3.8.14.1 Strunz No: II/E.14-40
Locality:

Notes: