Imiterite

imiterite

polybasite

argentite

cinnabar

Images

Formula: Ag2HgS2
Sulphide
Specific gravity: 7.85
Hardness: 2½ to 3
Streak: Dark grey
Colour: Black
Environments

Hydrothermal environments

Localities

At Ramsbeck, North Rhine-Westphalia, Germany, imiterite occurs in a hydrothermal vein deposit associated with acanthite, pyrite, marcasite, polybasite and calcite (HOM).

The type locality is the Imiter mine, Tinghir Cercle, Tinghir Province, Drâa-Tafilalet Region, Morocco, where imiterite is hydrothermally formed at temperatures around 70oC; above 215oC a combination of argentite and cinnabar crystallises instead. Imiterite occurs either in quartz veins or, much more commonly, in cavities in dolomite veins.
In quartz veins it occurs with proustite - pyrargyrite ores, often overgrown by acanthite or cinnabar, and partial pseudomorphs of these minerals after imiterite are known. It also forms crusts on the walls of quartz cavities associated with proustite and xanthoconite.
In dolomite veins imiterite sometimes forms a substrate on which small crystals of siderite and calcite rest; occasionally it is found overgrown on acanthite, or it may be associated with cinnabar and freibergite (Min Rec 42-2.125). Other associated minerals include chalcopyrite, sphalerite, polybasite, galena and arsenopyrite (AM 71.1278, HOM).

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