Jôkokuite
Jôkokuite is a manganese sulfate mineral with chemical formula MnSO4・5H2O. It crystallizes in the triclinic crystal system. It was discovered in 1976 by Matsuo Nanbu at the Jokoku mine in Hokkaido, and is named after the location.
| Jôkokuite | |
|---|---|
Jôkokuite from Jokoku Mine, Hokkaido, Japan | |
| General | |
| Category | Sulfate minerals |
| Formula (repeating unit) | MnSO4・5H2O |
| IMA symbol | Jôk |
| Strunz classification | 07.CB.20 |
| Dana classification | 29.6.7.4 |
| Crystal system | Triclinic |
| Crystal class | Pinacoidal (1) (same H-M symbol) |
| Space group | P1 |
| Unit cell | a = 6.37 Å b = 10.77 Å c = 6.13 Å |
| Identification | |
| Color | Pink, pale pink, light pink, white, colorless |
| Cleavage | None |
| Fracture | Conchoidal |
| Mohs scale hardness | 2.5 |
| Luster | Vitreous |
| Streak | White |
| Diaphaneity | Transparent to translucent |
| Specific gravity | 2.03 |
| Optical properties | Biaxial (−) |
| Solubility | Soluble in water |
| References | |
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