Hidalgoite

hidalgoite

mansfieldite

carbonatecyanotrichite

beudantite

Images

Formula: PbAl3(AsO4)(SO4)(OH)6
Arsenate, beudantite group
Crystal System: Trigonal
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 arsenic mineral in the oxidised zone of polymetallic sulphide deposits. Localities

At the type locality, the San Pascual Mine, Mexico, hidalgoite occurs in an oxidised ore vein, associated with beudantite, tourmaline, limonite, mansfieldite and carbonatecyanotrichite (AM 38.1218).

At the Guatomo Mine, Tham Thalu, Bannang Sata District, Yala Province, Thailand, pale green microcrystalline pseudomorphs of hidalgoite after mimetite crystals have been found (Mindat Photo)
Hidalgoite from the Guatomo Mine - Image

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