Mineralogy Database

Perroudite Mineral Data

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General Perroudite Information

Help on Chemical  Formula: Chemical Formula: Hg5Ag4S5(I,Br)2Cl2
Help on Composition: 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 % 
Help on Empirical Formula: Empirical Formula: Hg5Ag4S4Cl1.6I1.6Br0.9
Help on Environment: Environment: An alteration of tennantite in sandstones and conglomerates.
Help on IMA Status: IMA Status: Approved IMA 1992
Help on Locality: Locality: Cap-Garonne, Var, France. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Pierre Perroud, Professor at Voltaire College, Geneva, Switzerland, for his work on Cap-Garonne minerals.
Help on Name Pronunciation: Name Pronunciation: Perroudite + Pronunciation Say PERROUDITE
Help on Synonym: Synonym: ICSD 202424
  PDF 42-1336

Perroudite Image

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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

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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

Help on Axial Ratios: Axial Ratios: a:b:c =1.4274:1:0.3448
Help on Cell Dimensions: Cell Dimensions: a = 17.4198, b = 12.2032, c = 4.2088, Z = 2; V = 894.70 Den(Calc)= 7.03
Help on Crystal System: Crystal System: Orthorhombic - Disphenoidal H-M Symbol (2 2 2) Space Group: P 212121
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.012(1), 2.965(0.8), 3.945(0.6),

Physical Properties of Perroudite

Help on Cleavage: Cleavage: {100} Perfect
Help on Color: Color: Light red.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Irregular - Very brittle fracture producing irregular fragments
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 2 - Gypsum
Help on Luster: Luster: Vitreous - Adamantine
Help on Streak: Streak: orange red

Optical Properties of Perroudite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.182 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.192,KC= 0.1624
Ncalc = 2.14
Help on Optical Data: Optical Data: Biaxial (+), a=2.3, b=2.4, , 2V(Meas)=~70. Dispersion r > v very strong.
Help on Pleochroism (x): Pleochroism (x): dark brownish red.
Help on Pleochroism (y): Pleochroism (y): yellow.
Help on Pleochroism (z): Pleochroism (z): brownish yellow.

Calculated Properties of Perroudite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.90 gm/cc
note: Specific Gravity of Perroudite =7.03 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.16
Boson Index = 0.84
Help on Photoelectric: Photoelectric: PEPerroudite =1,001.26 barns/electron
U=PEPerroudite x rElectron Density=5,911.61 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Perroudite is Not Radioactive

Perroudite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.15.05)Dana Group Perroudite Hg5-xAg4xS5-x(Cl,I,Br)4x P 212121 2 2 2
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Am.Min.,Vol.72,p1251-1256,1987) OPTIC PROP.(Am.Min.,Vol.72,p1251-1256,1987)
Help on See Also: 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

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Dana No: Strunz No: 02.FC.20c





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