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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 (repeating unit) | 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] |
References
edit- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ a b "Jôkokuite". www.mindat.org. Retrieved 2023-01-15.
- ^ a b "Jokokuite". webmineral.com. Retrieved 2023-01-15.
- ^ 松原聡 (2006). フィールドベスト図鑑 vol.15 日本の鉱物. 株式会社学習研究社. ISBN 4-05-402013-5.