Crystal System: Monoclinic
Status of Occurrence: Confirmed Occurrence - 2nd UK recording
Distribution: Rare
Chemical Composition: Silver arsenic sulphide
Chemical Formula: Ag3AsS3
Method(s) of Verification: Dolyhir Quarry - XRD (Manchester Museum).

Chemical Group:

  • Sulphosalts

Geological Context:

  • Hydrothermal
Xanthoconite from Dolyhir Quarry. Neil Hubbard Collection. Photo D.I. Green, © D.I. Green.
Introduction: a rare silver-bearing mineral found with other silver sulfosalts in hydrothermal veins.
Occurrence in Wales: xanthoconite has recently been identified as rare microcrystals at Dolyhir Quarry in the Welsh borderland (D.I. Green, unpublished data). A full description of the mineralogy of this quarry is in preparation.

Key Localities:

  • Dolyhir Quarry, Old Radnor, Powys: recently identified as microcrystals on a specimen collected by Neil Hubbard.


There are no references for this specimen.