Formula: PbAl3(AsO4)(SO4)(OH)6
Specific gravity: 3.71 to 3.96
Hardness: 4½
Streak: White
Colour: White
Solubility: Insoluble in hydrochloric, nitric and sulphuric acid.

Hydrothermal environments

Hidalgoite is a secondary mineral in the oxidised zone of polymetallic sulphide deposits. At the type locality, the San Pascual Mine, Mexico, it occurs in an oxidised ore vein, associated with beudantite, tourmaline, limonite, mansfieldite and carbonate-cyanotrichite (AM 38.1218).

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