In vesicles in contact metamorphosed basement gneiss xenoliths in leucite tephrite (Bellerberg volcano, Germany); an accessory mineral in an enstatite chondrite (Indarch meteorite). Forms a series with eifelite.
Approved IMA 1966
In the Indarch, Witchita County, and Canyon Diablo meteorites. Link to MinDat.org Location Data.
Named for Edwin Woods Roedder (1919- ), mineralogist, U.S. Geological Survey, who noted the synthetic compound.