Iltisite Mineral Data

Iltisite Mineral Data +

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General Iltisite Information

Chemical Formula:

HgSAg(Cl,Br)

Composition:

Molecular Weight = 387.09 gm

Silver 27.87 % Ag

Mercury 51.82 % Hg

Sulfur 8.28 % S

Bromine 5.16 % Br

Chlorine 6.87 % Cl

______

100.00 %

Empirical Formula:

HgSAgCl_0.75Br_0.25

Environment:

In small cavities in conglomerate. A hexagonal polymorph of capgaronnite.

IMA Status:

Approved IMA 1997 (Dana # Added)

Locality:

The Cap Garonne mine, near Le Pradet, Var, France. Link to MinDat.org Location Data.

Name Origin:

For Antoine Iltis (1942-), who found the mineral.

Synonym:

IMA1994-031

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Iltisite Crystallography

Axial Ratios:

a:c = 1:2.35365

Cell Dimensions:

a = 8.234, c = 19.38, Z = 12; V = 1,137.91 Den(Calc)= 6.78

Crystal System:

Hexagonal - TrapezohedralH-M Symbol (6 2 2) Space Group: P 6₂,P 6₂22

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

By Intensity(I/I_o): 2.879(1), 3.357(0.6), 3.127(0.5),

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Forms: [ 1 0 1] [ 0 0 1]

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Physical Properties of Iltisite

Cleavage:

[001] Perfect

Color:

Red, Brownish red.

Density:

6.59

Diaphaniety:

Translucent

Fracture:

Fragile - Crystals with a delicate and easily injured structure.

Habit:

Disseminated - Occurs in small, distinct particles dispersed in matrix.

Habit:

Platy - Sheet forms (e.g. micas).

Luster:

Adamantine

Streak:

red

Optical Properties of Iltisite

Gladstone-Dale:

CI meas= -0.133 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.101 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.177,KPDmeas= 0.1821,KC= 0.1608

Optical Data:

Uniaxial (-), e=2.1, w=2.3, bire=0.2000.

Calculated Properties of Iltisite

Electron Density:

r_electron=5.76 gm/cc
note: r_Iltisite=6.78 gm/cc.

Fermion Index

Fermion Index = 0.15711
Boson Index = 0.84289

Photoelectric:

PE_Iltisite= 943.53 barns/electron
U=PE_Iltisite x r_electron=5,437.14 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Iltisite is Not Radioactive

Iltisite Classification

Dana Class:

2.15.6.2 (2)Sulfides - Including Selenides and Tellurides

(2.15)(Chlorides)

(2.15.6)Dana Group

2.15.6.1 Capgaronnite HgAg(Cl,Br,I)S P 2₁2₁2₁ 2 2 2

2.15.6.2 Iltisite ! HgSAg(Cl,Br) P 6₂,P 6₂22 6 2 2

Strunz Class:

II/F.13-05 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 Iltisite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.83,p401,1998) OPTIC PROP.(MinRec)

See Also:

Links to other databases for Iltisite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas

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Iltisite

HgSAg(Cl,Br)
Dana No: 2.15.6.2 Strunz No: II/F.13-05
Locality:

Notes: