Larvikite occurs only in the Oslo-rift. It originally crystallised at a depth of 3 to 4 km below the earth's surface. The rock is typically pale or dark grey in colour and is composed mainly of feldspar. The characteristic blue sheen seen in reflected light, is caused by slight difference in composition and layering of the feldspar crystals. Larvikite is an exclusive building stone used all over the world. In London the ground floor of Harrods is laid with larvikite also used as a facing stone on numerous other buildings.
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