Perroudite Mineral Data

Perroudite Mineral Data +

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General Perroudite Information

Chemical Formula:

Hg5-xAg4+xS5-x(Cl,I,Br)4+x

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.

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

Perroudite Crystallography

Axial Ratios:

a:b:c =1.4284:1:0.3507

Cell Dimensions:

a = 17.47, b = 12.23, c = 4.29, Z = 2; V = 916.59 Den(Calc)= 6.86

Crystal System:

Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: P 2₁2₁2

$Help on X Ray Diffraction:$ 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.

Diaphaniety:

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= -0.212 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1968,KC= 0.1624

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:

r_electron=5.76 gm/cc
note: r_Perroudite=6.86 gm/cc.

Fermion Index

Fermion Index = 0.16039
Boson Index = 0.83961

Photoelectric:

PE_Perroudite=1,001.26 barns/electron
U=PE_Perroudite x r_electron=5,768.66 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Perroudite is Not Radioactive

Perroudite Classification

Dana Class:

2.15.5.1 (2)Sulfides - Including Selenides and Tellurides

(2.15)(Chlorides)

(2.15.5)Dana Group

2.15.5.1 Perroudite Hg5-xAg4xS5-x(Cl,I,Br)4x P 2₁2₁2 2 2 2

Strunz Class:

II/F.13-20 II - Sulfides and sulphosalts

II/F - Sulfides with nonmetallic properties, Halogensulfides (Sulfohalides) with Mercury/Lead and related compounds

II/F.13 - Capgaronnite-Perroudite series

II/F.13-05 Iltisite! HgSAg(Cl,Br) P 6₂,P 6₂22 6 2 2

II/F.13-10 Capgaronnite HgAg(Cl,Br,I)S P 2₁2₁2₁ 2 2 2

II/F.13-20 Perroudite Hg5-xAg4xS5-x(Cl,I,Br)4x P 2₁2₁2 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)

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Perroudite

Hg5-xAg4+xS5-x(Cl,I,Br)4+x
Dana No: 2.15.5.1 Strunz No: II/F.13-20
Locality:

Notes: