Larvikite is an igneous rock, specifically a variety of monzonite,[1] notable for the presence of thumbnail-sized crystals of feldspar.

[2] Larvikite is also found in the Killala Lake Alkalic Rock Complex near Thunder Bay in Ontario, Canada.

Intrusions of larvikite in Norway form part of the suite of igneous rocks that were emplaced during the Permian period, associated with the formation of the Oslo Rift.

[1] Larvikite is prized for its high polish and the labradorescence of its feldspar crystals, and is used as dimension stone, often cladding the facades of commercial buildings and corporate headquarters.

Larvikite has been designated by the International Union of Geological Sciences as a Global Heritage Stone Resource.