Laurionite
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Laurionite is a lead halide mineral. It forms colorless to white crystals in the orthorhombic crystal system and is dimorphous with paralaurionite, both members of the matlockite group.
Laurionite crystals in a vug from the Laurium district of Greece
Penfieldite
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Penfieldite is a rare lead hydroxychloride mineral from the class of halides. It was named after Samuel Lewis Penfield. It has been a valid species before the founding of IMA, and was first published
Laurionite
…product in lead ore deposits, and is also produced on lead-bearing slag by reaction with saline solutions. It occurs associated with paralaurionite, penfieldite, fiedlerite, phosgenite, cerussite and anglesite…
Penfieldite.Margarita Mine, Caracoles, Sierra Gorda District, Tocopilla Province, Antofagasta Region, Chile formula=Pb2Cl3(OH)