Formula: Sb3+Sb5+2O6(OH)
Forms pseudomorphs after stibnite
Specific gravity: 3.3 to 5.6
Hardness: 3 to 5
Streak: White
Colour: White to yellow or brown

Hydrothermal environments

Stibiconite is a secondary mineral in hydrothermal mineral deposits, formed by the oxidation of other antimony-bearing minerals, commonly stibnite, which it may entirely replace. Associated minerals include cervantite, valentinite, kermesite, antimony and stibnite (HOM).

In China, stibiconite occurs as a secondary mineral, often forming pseudomorphs after stibnite, in the oxidised zone of antimony deposits at several locations, including the Dachang deposit in Guizhou, the Dahegou mine in Henan, the Xikuangshan deposit in Hunan and the Wuning mine in Jiangxi (AES).

At Schemnitz, Slovakia, stibiconite occcurs with stibnite (FM OP33).

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