General 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
Empirical Formula:
HgSAgCl0.75Br0.25
Environment:
In small cavities in conglomerate. A hexagonal polymorph of capgaronnite.
IMA Status:
Approved IMA (Dana # Added)
Locality:
The Cap Garonne mine, near Le Pradet, Var, France.
Name Origin:
For Antoine Iltis (1942-), who found the mineral.
Physical Properties:
Cleavage:
[001] Perfect
Color:
red or brownish red.
Density:
6.59
Diaphaniety:
Translucent
Habits:
Platy - Sheet forms (e.g. micas)., Disseminated - Occurs in small, distinct particles dispersed in matrix.,
Luminescence:
Non-fluorescent.
Luster:
Adamantine
Streak:
red
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