Laurionite

(repeating unit)PbCl(OH)IMA symbolLri[1]Strunz classification3.DC.05Crystal systemOrthorhombicCrystal classDipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)Space groupPnmaUnit cella = 7.111, b = 9.6987
c = 4.0203 [Å]; Z = 4IdentificationColorColorless, whiteCrystal habitElongated tabular prismatic crystalsCleavageDistinct on {101}TenacityFlexibleMohs scale hardness3–3.5LusterAdamantine, pearlyStreakWhiteDiaphaneityTransparentSpecific gravity6.241Optical propertiesBiaxial (−)Refractive indexnα = 2.077 nβ = 2.116 nγ = 2.158Birefringenceδ = 0.0812V angleMeasured: 70°SolubilitySleight in cold waterReferences[2][3][4][5]

Laurionite (PbCl(OH)) 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.[2]

It was first described in 1887 for an occurrence in the Laurium District, Attica, Greece, and named after the town Laurium.[2] It occurs as an oxidation 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.[3]

References

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ a b c Mindat.org
  3. ^ a b Handbook of Mineralogy
  4. ^ Webmineral data for laurionite
  5. ^ Mineralienatlas


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