What is "sekaninaite"

n. (context mineralogy English) A mineral with the chemical formula ((Fe⁺²,Mg)₂Al₄Si₅O₁₈).

Sekaninaite ((Fe,Mg)AlSiO) 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 Czech mineralogist, Josef Sekanina (1901–1986). In Brockley, Ireland sekaninaite occurs in bauxitic clay within the contact aureole of a diabase intrusive plug.