Mineral | Arfvedsonite | Na3(Fe2+4Fe3+)Si8O22(OH)2 | Amphibole
Arfvedsonite forms in alkaline igneous rocks and appears regionally as transported fragments. Occurs in erratics derived from alkaline intrusions.
Arfvedsonite Displays These Colors
Black | Blue Black
Arfvedsonite is Found in These Surrounding States
Ohio | Indiana | Kentucky | West Virginia | Pennsylvania | Michigan