Janggunite

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Janggunite
General
CategoryOxide mineral
Formula
(repeating unit)		Mn5-x(Mn,Fe)1+xO8(OH)6
Strunz classification4.FG.05
Crystal systemOrthorhombic
Unknown space group
Unit cella = 9.324, b =14.05
c = 7.956 [Å], Z = 4
Identification
ColorBlack
CleavagePerfect,one direction
TenacityFragile
Mohs scale hardness2 - 3
LusterDull
StreakBrownish black to dark brown
Specific gravity3.59
Optical propertiesBiaxial
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

  1. ^ Handbook of Mineralogy
  2. ^ a b Mindat.org
  3. ^ Webmineral data

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