| Jôkokuite | |
| Category: | Sulfate minerals |
| Formula: | MnSO4・5H2O |
| Imasymbol: | Jôk[1] |
| Strunz: | 07.CB.20 |
| Dana: | 29.6.7.4 |
| System: | Triclinic |
| Class: | Pinacoidal (same H-M symbol) |
| Symmetry: | P |
| Unit Cell: | a = 6.37 Å b = 10.77 Å c = 6.13 Å |
| Color: | Pink, pale pink, light pink, white, colorless |
| Cleavage: | None |
| Fracture: | Conchoidal |
| Mohs: | 2.5 |
| Luster: | Vitreous |
| Opticalprop: | Biaxial (−) |
| Streak: | White |
| Gravity: | 2.03 |
| Solubility: | Soluble in water |
| Diaphaneity: | Transparent to translucent |
| References: | [2] [3] |
Jôkokuite is a manganese sulfate mineral with chemical formula MnSO4・5H2O. It crystallizes in the triclinic crystal system.[2] [3] It was discovered in 1976 by Matsuo Nanbu at the Jokoku mine in Hokkaido, and is named after the location.[4]