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Perroudite Mineral Data
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General Perroudite Information
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Chemical Formula: |
Hg5Ag4S5(I,Br)2Cl2 |
Composition: |
Molecular Weight = 1,894.37 gm |
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Silver 22.78 % Ag |
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Mercury 52.94 % Hg |
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Sulfur 6.77 % S |
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Iodine 10.72 % I |
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Bromine 3.80 % Br |
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Chlorine 2.99 % Cl |
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______ |
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100.00 % |
Empirical Formula: |
Hg5Ag4S4Cl1.6I1.6Br0.9 |
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 |
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PDF 42-1336 |
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Perroudite Image |
Images:
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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 |
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Images:
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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 |
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Perroudite Crystallography
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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 - Disphenoidal H-M Symbol (2 2 2) Space Group: P 212121 |
X Ray Diffraction: |
By Intensity(I/Io): 3.012(1), 2.965(0.8), 3.945(0.6), |
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Physical Properties of Perroudite
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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 |
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Optical Properties of Perroudite
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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. |
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Calculated Properties of Perroudite
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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: |
PEPerroudite =1,001.26 barns/electron U=PEPerroudite x rElectron Density=5,911.61 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Perroudite is Not Radioactive |
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Perroudite Classification
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Dana Class: |
02.15.05.01 (02)Sulfides - Including Selenides and Tellurides |
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(02.15)(Chlorides) |
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(02.15.05)Dana Group |
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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 |
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02.F - Sulfides of Arsenic, Alkalies; Sulfides with Halide, Oxide, Hydroxide, H2O |
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02.FC -With Cl, Br, I (halide-sulfides) |
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02.FC.20c Perroudite Hg5-xAg4xS5-x(Cl,I,Br)4x P 212121 2 2 2 |
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Other Perroudite Information
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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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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:
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