Jôkokuite
Sulfate mineral
From Wikipedia, the free encyclopedia
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]
| Jôkokuite | |
|---|---|
 Jôkokuite from Jokoku Mine, Hokkaido, Japan | |
| General | |
| Category | Sulfate minerals |
| Formula | MnSO4・5H2O |
| IMA symbol | Jôk[1] |
| 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 | [2][3] |