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Formula: Pb31Cu24Cl62(OH)48
Hydroxyhalide
Crystal System: Tetragonal
Specific gravity: 4.85 measured, 5.07 calculated
Hardness: 2½
Streak: Light green
Colour: Indigo blue, green-blue
Solubility: Soluble in nitric acid
Environments
Pseudoboleite is a secondary mineral formed through reaction of
chloride with primary sulphides in the oxidised zone of
lead-copper deposits, or in smelter slag immersed
in seawater. It is sometimes epitaxial on boleite
(Mindat, HOM).
Localities
At the type locality, the Boleo District, Santa Rosalía, Mulegé Municipality, Baja California Sur, Mexico,
pseudoboleite is associated with boleite,
cumengeite, atacamite,
anglesite, cerussite,
phosgenite and gypsum
(HOM).
At the Daisy Mine, Mineral Hill Mines, Mineral Hill, Mission complex, San Xavier, Pima Mining District, Sierrita Mountains,
Pima county, Arizona, USA, pseudoboleite occurs with connellite,
gerhardtite and cumengeite
(Dana).
At the Mammoth-Saint Anthony Mine, St. Anthony deposit, Tiger, Mammoth Mining District, Pinal County, Arizona, USA,
pseudoboleite occurs with connellite,
gerhardtite and cumengeite
(Dana).
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