Borospherene (B₄₀) is a cluster molecule containing 40 boron atoms. It is similar to buckminsterfullerene, the "spherical" carbon structure, but with a different symmetry. The discovery of borospherene was announced in July 2014, and is described in the journal Nature Chemistry. Borospherene is the latest in a series of cluster molecules, including buckminsterfullerene (C₆₀), stannaspherene, and plumbaspherene. The newly discovered molecule includes unusual heptagonal faces.