Babingtonite is a calcium iron manganese inosilicate mineral with the formula Ca2(Fe,Mn)FeSi5O14(OH).

It is unusual in that iron(III) completely replaces the aluminium so typical of silicate minerals.

It is a very dark green to black translucent (in thin crystals or splinters) mineral crystallizing in the triclinic system with typically radial short prismatic clusters and druzy coatings.

It was first described in 1824 from samples from Arendal, Aust-Agder, Norway (which is its type locality) and was named after the Irish physician and mineralogist William Babington (1757–1833).

[5] The first published report of babingtonite in Massachusetts was by Francis Alger in 1844,[6] who credited Thomas Nuttall with its discovery in Charlestown (now Somerville).