Johannsenite

Johannsenite Mineral From Iron Cap Mine Aravaipa District Graham Co Arizona USA Size- 5cm x 4.8cm x 3cm Weight- 57g You will receive the item in the photo 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.