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Formula: AgBiS2
Sulphosalt, matildite group,
paramorph of
schapbachite, bismuth-bearing
mineral. Above 215oC a solid solution between matildite and
galena is complete; below this temperature characteristic Widmanstätten
structure-like textures are formed through exsolution
(Mindat).
Crystal System: Trigonal
Specific gravity: 6.9 measured, 6.9 calculated
Hardness: 2½
Streak: Light grey
Colour: Iron-black to grey
Environments
Pegmatites
Hydrothermal environments
Matildite occurs in moderate to high temperature hydrothermal deposits and in pegmatites, associated with
galena, pavonite,
aikinite, bismuthinite,
hessite, tetradymite,
pyrite, chalcopyrite,
sphalerite, arsenopyrite and
tetrahedrite
(HOM).
Localities
The type locality is the Matilda mine, Morococha District, Yauli Province, Junín, Peru.
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