棱晶烷的化学式为C₆H₆，是苯的价键异构体之一。

1868年德国化学家阿尔贝特·**堡首次发现棱晶烷。

Prismane is a polycyclic hydrocarbon with the formula C₆H₆. It is an isomer of benzene, specifically a valence isomer. Prismane is far less stable than benzene. The carbon (and hydrogen) atoms of the prismane molecule are arranged in the shape of a six-atom triangular prism—this compound is the parent and simplest member of the prismanes class of molecules. Albert Ladenburg proposed this structure for the compound now known as benzene. The compound was not synthesized until 1973.