Specific gravity: 3.71 to 3.96
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,
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