Collection: Johannsenite

Johannsenite is a calcium-manganese silicate.
Crystal system-monoclinic
Habit-it typically forms elongated prismatic crystals,column like aggregates,radiating fibrous masses,or granular clusters.
Mineral class- Silicate
Rock formation- Johannsenite is a classic metamorphic mineral that forms under specific geochemical conditions.
Primary environment- it occurs predominantly in manganiferous contact metamorphic zones and skarn deposits. Skarns form when hot,chemically aggressive magmatic fluids intrude in carbonate rocks (like limestone or dolostone)
If surrounding carbonate rocks or invading fluids are rich in manganese and calcium,Johannsenite forms along contact boundary.