Janggunite
Janggunite is a rare manganese oxide mineral with the chemical formula.
It was first described in 1975 for an occurrence in the Janggun mine, Bonghwa-gun, Gyeongsangbuk-do, South Korea and named for the locality.
Janggunite is a rare manganese oxide mineral with the chemical formula.
It was first described in 1975 for an occurrence in the Janggun mine, Bonghwa-gun, Gyeongsangbuk-do, South Korea and named for the locality.