Cadwaladerite

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.[2][3][4] It was first described in 1941 for an occurrence in mine dumps of the Victoria Segunda mine Cerros Pintados, Iquique province, Tarapacá Region, Chile.[3] It was named for Charles Meigs Biddle Cadwalader, president of the Academy of Natural Sciences.[4] Lesukite was discredited (IMA2018-H).

Cadwaladerite
General
CategoryHalide mineral
Formula
(repeating unit)		AlCl(OH)2·4(H2O)
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[1][2][3][4]

References
  1. Mineralienatlas
  2. Cadwaladerite Mineral Data - Webmineral
  3. Cadwaladerite mineral information and data - Mindat.org
  4. Handbook of Mineralogy


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