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Janggunite
Type Locality
Janggun mine, Bonghwa-gun, Gyeongsangbuk-do (Kyongsang-bukto; Gyeongsangbugdo), South Korea
Mineral Data
Mn
5-x
(Mn,Fe)
1+x
O
8
(OH)
6
Strunz:
4.FG.05
Physical Properties
Colour:
black
Hardness:
2.0 - 3.0
Tenacity:
fragile
