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Formula: PbAl3(AsO4)(SO4)(OH)6
Arsenate, beudantite group
Specific gravity: 3.71 to 3.96
Hardness: 4½
Streak: White
Colour: White
Solubility: Insoluble in hydrochloric, nitric and sulphuric acid.
Hidalgoite is a secondary
arsenic 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
carbonatecyanotrichite
(AM 38.1218).
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