Topic summary
Sekaninaite
Sekaninaite ((Fe,Mg)2Al4Si5O18) is a silicate mineral, the iron-rich analogue of cordierite.
It was first described in 1968 for an occurrence in Dolní Bory, Vysočina Region, Moravia, Czech Republic, and is now known also from Ireland, Japan, and Sweden. It was named after a Czechmineralogist, (1901–1986). In Brockley on Rathlin Island, Ireland sekaninaite occurs in bauxitic clay within the contact aureole of a diabase intrusive plug.