Antimony is seldom found in the native state, but it does occur in antimony-silver hydrothermal veins with silver, antimony and arsenic minerals (Webmin, Dana, HOM). Associated minerals include silver, stibnite, stibarsen, sphalerite, pyrite, galena and quartz (HOM, Dana, Mindat).
Localities
At Wet Swine Gill, Coombe Height, Caldbeck, Allerdale, Cumbria, England, UK, veins of native antimony in association with coatings of yellow bindheimite have been found (AESS).
Antimony from Wet Swine Gill - Image
At the Driggith mine, Caldbeck Fells, Cumbria, England, UK, minute grains of antimony are associated with inclusions of bournonite in galena (C&S).
Alteration
skinnerite to chalcocite, antimony and sulphur
2Cu3SbS3 → 3Cu2S + 2Sb + 3/2S2
(CM 28.725-738)
Zn-tetrahedrite to chalcocite, antimony, sphalerite and sulphur
Cu10Zn2Sb4S13 → 5Cu2S + 4Sb + 2ZnS + 3S2
(CM 28.725-738)
Zn-tetrahedrite to skinnerite, antimony, sphalerite and sulphur
3Cu10Zn2Sb4S13 → 10Cu3SbS3 + 2Sb + 6ZnS + 3/2S2
(CM 28.725-738)
The diagram below is a Pourbaix diagram for antimony (GSJ). It shows the relationship between antimony Sb and cervantite/clinocervantite Sb2O4.
The commonest ore of antimony is stibnite
Antimony-bearing minerals include:
Alloys
allargentum
dyscrasite
genkinite
mertieite
naldrettite
paradocrasite
pararsenolamprite
sluzhenikinite
stibarsen
stibiopalladinite
stistaite
Arsenides - the arsenide anion is As3-
oenite
Antimonides - the antimonide anion is Sb3-
aurostibite
breithauptite
geversite
nisbite
sudburyite
Sulphides - the sulphide anion is S2-
andrieslombaardite
cetineite
costibite
getchellite
kermesite
nagyágite
pääkkönenite
paracostibite
stibnite
ullmannite
wakabayashilite
willyamite
Sulphosalts - sulphide minerals with the general formula AmBnXp, where A represents a metal , B usually represents a semi-metal and X is sulphur or rarely selenium and/or tellurium