Antimony occurs in association with stibnite, gudmundite, arsenopyrite, quartz and carbonates.
Berthierite is a relatively widespread mineral at the Pezinok mine, associated mainly with stibnite and gudmundite.
Gudmundite occurs commonly as isolated, anhedral, isometric grains to 2 mm and in aggregates to 5 mm, mainly in stibnite, berthierite, quartz and carbonates.
It is associated mainly with carbonates, gudmundite, pyrite and stibnite.
Using an X-ray spectrometer as the main device in the mineralogical study, the effects of pulp properties (in soda or lime environment) and flotation kinetics were evaluated: gudmundite
(FeSbS) is depressed in soda as well as in a lime environment; boulangerite ([Pb.
It is nearly always associated with abundant quartz, gudmundite and dolomite, often with stibnite, and occasionally with pyrrhotite or berthierite.
It commonly forms sharp rhombohedral crystals up to 2 mm, associated with quartz, albite, stibnite and gudmundite.
It has been observed as tiny, 1-mm cleavages associated with resinous, pale brown sphalerite and minor gudmundite in quartz, as microscopic inclusions in gudmundite, and as a granular gray mass replacing stibnite on one specimen.
Worldwide, gudmundite is a relatively uncommon mineral, but it occurs fairly abundantly at the Lac Nicolet mine as 1-2 mm prismatic crystals generally resembling marcasite.
Like galena, sphalerite is very rare at the Lac Nicolet deposit, having been confirmed in only a very few specimens as tiny brown grains and cleavages up to 3-4 mm in quartz associated with either galena or gudmundite.
Along with gudmundite and native antimony, stibnite was one of the primary ore minerals mined from this deposit.