Atelestite

arsenate

hydrothermal

Formula: Bi2O(AsO4)(OH)
Anhydrous arsenate with hydroxyl
Specific gravity: 6.82
Hardness: 4½ to 5
Colour: Sulphur-yellow to yellowish-green or wax-yellow, yellow-brown; light yellow to colourless in transmitted light.
Solubility: Readily soluble in hydrochloric acid; soluble with difficulty in nitric acid.
Environments

Hydrothermal environments

Atelestite is a rare secondary mineral that occurs in the oxidised zone of bismuth- and arsenic-bearing mineral deposits, associated with bismutite, eulytine, erythrite, bismutostibiconite, beyerite, preisingerite, walpurgite, mixite, conichalcite, torbernite and quartz (HOM, Webmin).

At the type locality, the Neuhilfe Mine, Erzgebirge, Saxony, Germany, atelestite is associated with quartz and bismutite (Mindat).

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