General Information:
Chemical Formula:HgSAg(Cl,Br)
Composition:(Molecular Weight = 387.09 gm)Silver 27.87 %
AgMercury 51.82 %
HgSulfur 8.28 %
S Bromine 5.16 %
BrChlorine 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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