Iltisite

iltisite

capgaronnite

perroudite

parnauite

Images

Formula: HgAgSCl
Valence: Hg²⁺Ag¹⁺S^2-Cl
Sulphide of mercury and silver, paramorph of capgaronnite
Crystal system: Hexagonal
Specific gravity: 6.59 calculated
Streak: Red
Colour: Red to red-brown
Luminescence: Not fluorescent under UV
Solubility: Insoluble in hydrochloric acid
Environments

Hydrothermal environments

Localities

At the type locality, the Cap Garonne Mine, Le Pradet, Toulon, Var, Provence-Alpes-Côte d'Azur, France, iltisite occursas red to brown-red, isolated, flattened hexagonal crystals, about 0.02 mm across. It is translucent with a red streak and adamantine lustre. It occurs in small cavities in quartz, associated with olivenite, perroudite, brochantite, capgaronnite, parnauite and tennantite (AM 83.400-403).
Iltisite from the Cap Garonne Mine - Image

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