Janggunite
Mn5−x(Mn,Fe)1+xO8(OH)6IMA symbol Jgn[1] 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 Luster Dull Streak Brownish black to dark brown Specific gravity 3.59 Optical properties Biaxial References [2][3][4]
c = 7.956 [Å], Z = 4
Janggunite is a rare manganese oxide mineral with the chemical formula Mn5−x(Mn,Fe)1+xO8(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.[3]
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