Arsenolite

oxide

arsenic mineral

Formula: As2O3
Simple oxide, dimorph of claudetite
Specific gravity: 3.87
Hardness: 1½
Streak: White to pale yellowish white
Colour: White, bluish; reddish to yellowish if impure with realgar or orpiment; colourless in transmitted light
Solubility: Slightly soluble in hot water
Environments:

Hydrothermal environments

Arsenolite is an oxidation product of other arsenic-bearing sulphides in hydrothermal veins, and it also may be formed in mine fires or in burning coal seams. (Dana, HOM).Associated minerals include claudetite, realgar, orpiment and erythrite (HOM).

At Rauenthal, Haute-Rhin, France, arsenolite forms as a direct oxidation product on native arsenic (Dana).

At Sorbier, Loire, France, arsenolite forms from burning coal dumps (Dana).

At Andreasberg, Hartz, Germany, arsenolite is found as an alteration product of skutterudite and other arsenides (Dana).

At the Lauta mine, near Marienberg, Saxony, Germany, arsenolite forms as an alteration product of arsenic (Dana).

At Bou Azzer, Morocco, arsenolite occurs in strongly weathered ores associated with erythrite, and with cobaltkoritnigite at Aghbar (MinRec 38.5.360).

At Morococha, Peru, arsenolite is associated with realgar and orpiment (Dana).

At the exchequer and Monitor mines, Alpine county, California, USA, arsenolite formed as an alteration product of enargite (Dana).

At the White Caps mine, Nye county, Nevada, USA, arsenolite formed from the burning of the shaft. (Dana).

At the Ophir mine, Storey county, Nevada, USA, arsenolite forms as an alteration of native arsenic (Dana).

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