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Larvikite is an igneous rock, specifically a variety of monzonite, (2025). 9788292394427, Norsk Geologisk Forening (Norwegian Geological Association). ISBN 9788292394427 notable for the presence of thumbnail-sized of feldspar. These feldspars are known as ternary because they contain significant components of all three endmember feldspars.
The feldspar has partly unmixed on the micro-scale to form a perthite, and the presence of the alternating alkali feldspar and plagioclase layers give its characteristic silver-blue schiller effect (called labradorescence) on polished surfaces. Olivine can be present along with apatite, and locally quartz. Larvikite is usually rich in titanium, with Augite and/or Magnetite present.
Larvikite occurs in the Larvik Batholith (also called the Larvik Plutonic Complex), a suite of ten igneous emplaced in the Oslo Rift (Oslo Graben) surrounded by ~1.1 billion year old Sveconorwegian . The Larvik Batholith is of Permian age, about 292–298 million years old. Larvikite geology Larvikite is also found in the Killala Lake Alkalic Rock Complex near Thunder Bay in Ontario, Canada.R. P. Sage (1988). 9780772905802, Ontario Geological Survey and Ministry of Northern Development and Mines. . ISBN 9780772905802
The name originates from the town of Larvik in Norway, where this type of igneous rock is found. Many quarries exploit larvikite in the vicinity of Larvik.
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