Fiedlerite

fiedlerite

penfieldite

cotunnite

laurionite

Formula: Pb₃Cl₄F(OH).H₂O
Chloride
Crystal System: Monoclinic
Specific gravity: 5.88 measured, 5.64 calculated
Hardness: 3½
Streak: White
Colour: Colourless, white; colourless in transmitted light
Solubility: Soluble in nitric acid
Environments

Hydrothermal environments

Fiedlerite is a secondary mineral produced by reaction of halide-bearing seawater and metal-bearing slag (HOM, Webmin).

Localities

At the type locality, Lavrion slag localities, Lavreotiki, East Attica, Attica, Greece, fiedlerite is associated with penfieldite, laurionite, phosgenite and cotunnite (HOM).

At the Baratti slag locality, Piombino, Livorno Province, Tuscany, Italy, fiedlerite is associated with penfieldite and cotunnite (HOM).

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