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Mineralpedia Details for Hidalgoite

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Hidalgoite

Hidalgoite

Named after the type locality at the San Pascual mine in the state of Hidalgo in Mexico. Hidalgoite is an uncommon mineral that can be found in additional localities in the United States, France, Switzerland, Germany, England, Australia, and Namibia, among a few others. It occurs as a secondary mineral in oxidized polymetallic sulfide deposits.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/hidalgoite.pdf

Formula
PbAl3(SO4)(AsO4)(OH)6 
Crystal System
Trigonal 
Cleavage
None, None, None 
Luster
Earthy (Dull) 
Color
gray white, white, light green, light gray 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Brittle - Conchoidal 
Hardness
4.5 
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Hidalgoite from Gold Hill mine, Tooele Co., Utah, United States

Hidalgoite
            from Gold Hill mine, Tooele Co., Utah, United States

Vitreous botryoidal crystals to 0.5mm.

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Hidalgoite from Tsumeb mine, Tsumeb, Namibia

Hidalgoite
            from Tsumeb mine, Tsumeb, Namibia

Excellent lime green acicular crystals of Hidalgoite to about 0.75mm.

Lime green very fine micro Hidalgoite crystals lining the many vugs of this specimen with dark green crystals of cuprian Adamite to 1mm. Hidalgoite from Tsumeb represents some of the best in the world.

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Hidalgoite from Kintore Opencut, Broken Hill, New South Wales, Australia

Hidalgoite
            from Kintore Opencut, Broken Hill, New South Wales, Australia

Olive or grass green crustations and overgrowths on Pyromorphite(?).

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