Crystal System: Monoclinic
Status of Occurrence: Confirmed Occurrence - 2nd UK recording
Chemical Composition: Silver arsenic sulphide
Chemical Formula: Ag3AsS3
Method(s) of Verification: Dolyhir Quarry - XRD (Manchester Museum).
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xanthoconite has recently been identified as rare microcrystals at Dolyhir Quarry in the Welsh borderland (D.I. Green, unpublished data).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.
- Dolyhir Quarry, Old Radnor, Powys: recently identified as microcrystals on a specimen collected by Neil Hubbard.
There are no references for this specimen.