The bacterial oxidation of iron sulfide minerals produces iron ( III ) sulfate and sulfuric acid, and in the case of arsenopyrite, arsenic acid is also produced.
32.
It is a low temperature hydrothermal mineral that occurs associated with vulcanite, native tellurium, cameronite, petzite, sylvanite, berthierite, pyrite, arsenopyrite and bornite.
33.
The mineral occurs in a quartz-garnet-arsenopyrite matrix as white globules, tufted aggregates of fibrous crystals and radiating hemispheres of thin, colourless, bladed crystals.
34.
At the type locality it occurs associated with magnetite, sphalerite, pyrrhotite, pyrite, arsenopyrite, chalcopyrite, digenite, bornite, molybdenite, galena, native bismuth and bismuthinite.
35.
Mariners is renowned for its extremely high arsenic contents, with common arsenopyrite, nickeline, gersdorffite and other arseno-sulfide minerals common in the ore during the earlier years of mining.
36.
Gold can also be associated with arsenopyrite ( FeAsS ), which is similar to iron pyrite ( fool's gold ), wherein half of the sulfur atoms are replaced by arsenic.
37.
It occurs in association with attakolite, svanbergite, lazulite, hematite, trolleite, berlinite, rutile, pyrophyllite, baryte, arsenopyrite, stannite, pyrite, andorite, cassiterite and zinkenite.
38.
One example of this is the Widgiemooltha Dome, where carbonated hematite-bearing siliceous basalts containing native gold, arsenopyrite, nickeline and gersdorffite are encountered in the footwall of the Miitel nickel mine.
39.
Assays exceeding 1 ounce of gold per ton have been obtained from three of these areas, and selected quartz-arsenopyrite vein material from one prospect assayed about 200 ounces of gold per ton.
40.
These include exceptional specimens of fluorapatite, ferberite, arsenopyrite, siderite, quartz and numerous other species such as : chalcopyrite, sphalerite, dolomite, calcite, mica, tourmaline, fluorite and topaz.
