| Cadwaladerite | |
| Category: | Halide mineral |
| Formula: | AlCl(OH)2·4(H2O) |
| Imasymbol: | Cwd[1] |
| Molweight: | 168.51 g/mol |
| Strunz: | 3.BD.05 |
| System: | amorphous |
| Color: | Lemon yellow |
| Fracture: | Conchoidal |
| Luster: | Vitreous |
| Refractive: | n = 1.513, variable |
| Opticalprop: | Isotropic |
| Gravity: | 1.66 |
| Diaphaneity: | transparent |
| Other: | 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).