| Aluminocopiapite | |
| Formula: | AlFe(SO)(OH)·20HO |
| Imasymbol: | Acpi |
| Color: | Pale lemon-yellow to deep yellow |
| Tenacity: | Fragile |
| Mohs: | 2-3 |
| Luster: | Vitreous |
| Diaphaneity: | Transparent, Translucent |
| Gravity: | 2.163 |
Aluminocopiapite (IMA symbol: Acpi[1]) is an aluminium iron sulfate mineral with the chemical formula AlFe(SO)(OH)·20HO. Its type localities are Fortymile River in Alaska and the San Rafael Swell in Utah.[2]