Hydroxyhalide, matlockite group, paramorph of paralaurionite
Specific gravity: 6.241
Hardness: 3 to 3½
Colour: Colourless, white
Solubility: Slightly soluble in cold water, more soluble in warm water. Soluble in nitric acid.
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
cerussite and anglesite
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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