Siderophyllite is a rare member of the mica group of silicate minerals with formula KFe2+2Al(Al2Si2)O10(F,OH)2.

The mineral occurs in nepheline syenite pegmatites and granite and aplite greisens.

It is also found in the alkali pegmatites of Mont Saint-Hilaire, Quebec.

The name derives from the Greek sideros, iron, and phyllon, leaf, in reference to its iron rich composition and perfect basal cleavage.

This article about a specific silicate mineral is a stub.