Perroudite Mineral Data

General Perroudite Information

Chemical Formula:

Hg5Ag4S5(I,Br)2Cl2

Composition:

Molecular Weight = 1,894.37 gm

Silver 22.78 % Ag

Mercury 52.94 % Hg

Sulfur 6.77 % S

Iodine 10.72 % I

Bromine 3.80 % Br

Chlorine 2.99 % Cl

______

100.00 %

Empirical Formula:

Hg₅Ag₄S₄Cl_1.6I_1.6Br_0.9

Environment:

An alteration of tennantite in sandstones and conglomerates.

IMA Status:

Approved IMA 1992

Locality:

Cap-Garonne, Var, France. Link to MinDat.org Location Data.

Name Origin:

Named for Pierre Perroud, Professor at Voltaire College, Geneva, Switzerland, for his work on Cap-Garonne minerals.

Name Pronunciation:

Perroudite + Pronunciation

Synonym:

ICSD 202424

PDF 42-1336

Perroudite Image

Images:

Perroudite

Comments: Cluster of needle-like crystals of red perroudite in quartz matrix.
Location: Gap Garonne Mine, Le Pradet, Var, France. Scale: Crystal size 1 mm.
© John Veevaert

Images:

Perroudite

Comments: SEM image of jack-straw aggregate of perroudite. Dr J. Wüest, MHNG, 1986 from type material.
Location: Cap Garonne, Le Pradet, Var, France. Scale: xls ~ 0.07 mm.
© Pierre Perroud

Perroudite Crystallography

Axial Ratios:

a:b:c =1.4274:1:0.3448

Cell Dimensions:

a = 17.4198, b = 12.2032, c = 4.2088, Z = 2; V = 894.70 Den(Calc)= 7.03

Crystal System:

Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: P 2₁2₁2₁

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

By Intensity(I/I_o): 3.012(1), 2.965(0.8), 3.945(0.6),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Mumme W G , Nickel E H , American Mineralogist , 72 (1987) p.1257-1262, Crystal structure and crystal chemistry of perroudite:, A mineral from Coppin Pool, Western Australia

Physical Properties of Perroudite

Cleavage:

{100} Perfect

Color:

Light red.

Diaphaneity:

Transparent

Fracture:

Brittle - Irregular - Very brittle fracture producing irregular fragments

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

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

Hardness:

2 - Gypsum

Luster:

Vitreous - Adamantine

Streak:

orange red

Optical Properties of Perroudite

Gladstone-Dale:

CI calc= -0.182 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.192,KC= 0.1624
Ncalc = 2.14

Optical Data:

Biaxial (+), a=2.3, b=2.4, , 2V(Meas)=~70. Dispersion r > v very strong.

Pleochroism (x):

dark brownish red.

Pleochroism (y):

yellow.

Pleochroism (z):

brownish yellow.

Calculated Properties of Perroudite

Electron Density:

Bulk Density (Electron Density)=5.90 gm/cc
note: Specific Gravity of Perroudite =7.03 gm/cc.

Fermion Index:

Fermion Index = 0.16
Boson Index = 0.84

Photoelectric:

PE_Perroudite=1,001.26 barns/electron
U=PE_Perroudite x rElectron Density=5,911.61 barns/cc.

Radioactivity:

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

Perroudite Classification

Dana Class:

02.15.05.01 (02)Sulfides - Including Selenides and Tellurides

(02.15)(Chlorides)

(02.15.05)Dana Group

02.15.05.01 Perroudite Hg5-xAg4xS5-x(Cl,I,Br)4x P 2₁2₁2₁ 2 2 2

Strunz Class:

02.FC.20c 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.F - Sulfides of Arsenic, Alkalies; Sulfides with Halide, Oxide, Hydroxide, H2O

02.FC -With Cl, Br, I (halide-sulfides)

02.FC.20c Perroudite Hg5-xAg4xS5-x(Cl,I,Br)4x P 2₁2₁2₁ 2 2 2

Other Perroudite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Am.Min.,Vol.72,p1251-1256,1987) OPTIC PROP.(Am.Min.,Vol.72,p1251-1256,1987)

See Also:

Links to other databases for Perroudite :
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 Perroudite 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 Perroudite Specimen Label here :

Perroudite

Hg5-xAg4+xS5-x(Cl,I,Br)4+x
Dana No: 02.15.05.01 Strunz No: 02.FC.20c
Locality:

Notes: