Cadwaladerite is a rare aluminium halide mineral with formula: AlCl(OH)2·4(H2O). It was reported for an amorphous substance associated with sulfate minerals and embedded in a halite crystal cluster. Its status is uncertain due to inadequate data.[3][4][5] It was first described in 1941 for an occurrence in mine dumps of the Victoria Segunda mine Cerros Pintados, Iquique province, Tarapacá Region, Chile.[4] It was named for Charles Meigs Biddle Cadwalader, president of the Academy of Natural Sciences.[5] Lesukite was discredited (IMA2018-H).

Cadwaladerite
Yellow microcrystals and masses of the very rare aluminium chloride-hydroxide mineral Cadwaladerite from only one the three known localities worldwide: Maria Mine, Caleta Vítor District, Arica & Parinacota Region, Chile.
General
CategoryHalide mineral
Formula
(repeating unit)
AlCl(OH)2·4(H2O)
IMA symbolCwd[1]
Strunz classification3.BD.05
Crystal systemamorphous
Identification
Formula mass168.51 g/mol
ColorLemon yellow
FractureConchoidal
LusterVitreous
Diaphaneitytransparent
Specific gravity1.66
Optical propertiesIsotropic
Refractive indexn = 1.513, variable
Other characteristicsdeliquescent
References[2][3][4][5]

References

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  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. ^ Mineralienatlas
  3. ^ a b Cadwaladerite Mineral Data - Webmineral
  4. ^ a b c Cadwaladerite mineral information and data - Mindat.org
  5. ^ a b c Handbook of Mineralogy