 Larvikite occurs in the Larvik Batholith (a.k.a.Larvik Plutonic Complex), a suite of 10 igneous plutons emplaced in the Oslo Rift (Oslo Graben) surrounded by ~1.1 billion year old Sveconorwegian gneisses.The Larvik Batholith is of Permian age, about 292–298 million years old.