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.

Name Pronunciation:

Parapierrotite + Pronunciation

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

Images:

Parapierrotite

Comments: Black semimetallic fragment of parapierrotite.
Location: Lookout Pass Area, southeast Tooele County, Utah, USA. Scale: See Image.
© Rruff Database

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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Forms: ( 0 1 0) ( 1 0 1) ( 1 0 0) ( 0 0 1)

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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

Diaphaneity:

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:

Bulk Density (Electron Density)=4.30 gm/cc
note: Specific Gravity of Parapierrotite =4.94 gm/cc.

Fermion Index:

Fermion Index = 0.0018471832
Boson Index = 0.9981528168

Photoelectric:

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

Radioactivity:

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

Parapierrotite Classification

Dana Class:

03.08.14.01 (03)Sulfides - Sulfosalts

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

(03.08.14)Dana Group

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

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

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

Parapierrotite

Tl(Sb,As)5S8
Dana No: 03.08.14.01 Strunz No: 02.HC.05f
Locality:

Notes: