Perroudite Mineral Data

Advertisment

Adamsminerals.com- Online mineral store front for mineral collectors

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

Search for Perroudite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Perroudite :

A Bijoux Google Search for Perroudite
Adam's Minerals Google Search for Perroudite
Cape Minerals Google Search for Perroudite
Dakota Matrix Minerals Google Search for Perroudite
Excalibur Mineral Corp. Google Search for Perroudite
Exceptional Minerals Google Search for Perroudite
John Betts Fine Minerals Search for Perroudite
McDougall Minerals Google Search for Perroudite
Mineral News Website Link
Rock and Mineral Shows Google Search for Perroudite
Weinrich Minerals, Inc. Google Search for Perroudite

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: