Specific gravity: 5.88
Colour: Colourless, white; colourless in transmitted light
Solubility: Soluble in nitric acid
Fiedlerite is a secondary mineral produced by reaction of halide-bearing
seawater and metal-bearing slag
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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