Ca₂(Fe,Mn)FeSi₅O₁₄(OH)

This sample of Babingtonite is displayed in the Smithsonian Museum of Natural History. Babingtonite is a silicate mineral which contains five of the "big 8" elements. Its composition is Ca₂(Fe,Mn)FeSi₅O₁₄(OH). The sample is about 15x16 cm and is from Mount Tom, Holyoke, Massachusetts. It is described as Babingtonite with prehnite and calcite. The color of Babingtonite is typically dark greenish-black.

Named after Dr. William Babington (21 May 1756 - 29 April 1833), Irish physician and mineralogist, founding member and President (from 1822 to 1824) of the Geological Society of London.