Isostructural with calzirtite. In a skarn assemblage resulted from metasomatic reactions affecting a felsic volcanic rock, followed by high-grade metamorphism in an environment of h igh f(O2 ) and silica undersaturation.
Approved IMA 1995 (Dana # Added)
The Langban iron-manganese deposit, Langban, Filipstad district, Varmland, Sweden. Link to MinDat.org Location Data.
Named after Urban Hiarne (1641-1724), a pioneer in Swedish geology.