Formula: Sb2O3
Simple oxide, dimorph of senarmontite, antimony mineral
Specific gravity: 5.76
Hardness: 2½ to 3
Streak: White
Colour: Colourless, white, light gray, light yellow
Solubility: Soluble in hydrochloric acid; easily fusible in a closed tube (Dana).

Hydrothermal environments

Valentinite is an oxidation product of various antimony minerals in the oxidised zone of hydrothermal antimony deposits (Webmin, HOM).
Associated minerals include stibnite, antimony, stibiconite, cervantite, kermesite and tetrahedrite (HOM, Mindat).

At Příbram, Central Bohemian Region, Czech Republic, valentinite occurs in galena (Dana).

At the type locality, Les Chalanches Mine, Isère, Auvergne-Rhône-Alpes, France, valentinite occurs as an oxidation product of antimony and stibarsen (Dana).

At the Picahotes mine, San Benito county, California, USA, valentinite occurs with stibnite (Dana).

Common impurities: As

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