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Formula: PbCl(OH)
Hydroxyhalide, matlockite group,
paramorph of
paralaurionite
Crystal System: Orthorhombic
Specific gravity: 6.241 measured, 6.212 calculated
Hardness: 3 to 3½
Streak: White
Colour: Colourless, white
Solubility: Slightly soluble in cold water, more soluble in warm water, soluble in nitric acid.
Environments
Laurionite is a secondary mineral produced by the action of saline water on
lead-bearing slag, and it also occurs in the oxidised zone of lead-bearing mineral deposits. Associated minerals include
paralaurionite, penfieldite,
fiedlerite, phosgenite,
cerussite and anglesite
(HOM, Mindat).
Localities
At the type locality, the Lavrion Mining District, Lavreotiki, East Attica, Attica, Greece, laurionite occurs in ancient lead slags
exposed to the action of seawater, associated with phosgenite,
paralaurionite, fiedlerite,
pyrite and galena
(Dana, Mindat).
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