Valentinite is a weathering product of hydrothermal antimony-bearing veins, where it forms as a secondary mineral through oxidation in the upper parts of the deposits.
It occurs associated with stibnite, native antimony, stibiconite, cervantite, kermesite and tetrahedrite.

A rich deposit of valentinite has been found in the Constantine province of Algeria.
This is the only deposit where it is mined as an ore, with 83% antimony.
In all other locations it occurs in negligible quantities.
Valentinite is a weathering product of hydrothermal antimony-bearing veins, where it forms as a secondary mineral through oxidation in the upper parts of the deposits. It occurs associated with stibnite, native antimony, stibiconite, cervantite, kermesite and tetrahedrite.
A rich deposit of valentinite has been found in the Constantine province of Algeria. This is the only deposit where it is mined as an ore, with 83% antimony. In all other locations it occurs in negligible quantities.
Valentinite