Chemistry:Janggunite
From HandWiki
| Janggunite | |
|---|---|
 Janggunite found in South Korea | |
| General | |
| Category | Oxide mineral |
| Formula (repeating unit) | Mn 5-x(Mn,Fe) 1+xO 8(OH) 6 |
| Strunz classification | 4.FG.05 |
| Crystal system | Orthorhombic |
| Space group | Pman |
| Unit cell | a = 9.324, b =14.05 c = 7.956 [Å], Z = 4 |
| Identification | |
| Color | Black |
| Cleavage | Perfect, one direction |
| Tenacity | Fragile |
| Mohs scale hardness | 2 - 3 |
| |re|er}} | Dull |
| Streak | Brownish black to dark brown |
| Specific gravity | 3.59 |
| Optical properties | Biaxial |
| References | [1][2][3] |
Janggunite is a rare manganese oxide mineral with the chemical formula Mn
5-x(Mn,Fe)
1+xO
8(OH)
6.
It was first described in 1975 for an occurrence in the Janggun mine, Bonghwa-gun, Gyeongsangbuk-do, South Korea and named for the locality.[2]
References
- ↑ Handbook of Mineralogy
- ↑ 2.0 2.1 Mindat.org
- ↑ Webmineral data
- ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W.
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