| 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 | |
| Category | Halide mineral |
| Formula | AlCl(OH)2·4H2O |
| IMA symbol | Cwd[1] |
| Strunz classification | 3.BD.05 |
| Crystal system | amorphous |
| Identification | |
| Formula mass | 168.51 g/mol |
| Color | Lemon yellow |
| Fracture | Conchoidal |
| Luster | Vitreous |
| Diaphaneity | transparent |
| Specific gravity | 1.66 |
| Optical properties | Isotropic |
| Refractive index | n = 1.513, variable |
| Other characteristics | deliquescent |
| References | [2][3][4][5] |
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).
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