Very rare. Red, dodecahedral crystals with a deceptively garnet-like appearance. The crystals are distributed unevenly sprinkled on the associated minerals, as individual crystals or more rarely as aggregates of intergrown crystals forming a crust. The colour may vary from brownish red to deep red and blackish red. Some crystals exhibit a zoned band of darker colour in the centre. The only crystal form observed is the dodecahedron {110}. (Larsen & Kolitsch 2012)
Virikkollen, Haneholmveien, Sandefjord, Vestfold, Norway