Janggunite
Janggunite | |
---|---|
General | |
Category | Oxide mineral |
Formula (repeating unit) | Mn5-x(Mn,Fe)1+xO8(OH)6 |
Strunz classification | 4.FG.05 |
Crystal system |
Orthorhombic Unknown space group |
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 |
Luster | 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 formula Mn5-x(Mn,Fe)1+xO8(OH)6.
It was first described in 1976 for an occurrence in the Janggun mine, Bonghwa-gun, Gyeongsangbuk-do, South Korea and named for the locality.[2]
References
This article is issued from Wikipedia - version of the 7/24/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.