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Larvikite is a member of the Feldspar family. The name originates from the Larvik Fjord region in Norway. It is sometimes misleadingly called "Black Moonstone" and even "Labradorite," more likely because they are all Feldspar minerals.
Larvikite is an igneous rock, precisely a variety of monzonite, notable for the presence of thumbnail-sized crystals 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. The alternating alkali feldspar and plagioclase layers give their characteristic silver-blue schiller effect (called labradorescence) on polished surfaces. Olivine can be present along with apatite and local quartz. Larvikite is usually rich in titanium, with titanaugite and titanomagnetite present.
Larvikite occurs in the Larvik Batholith (also called the Larvik Plutonic Complex), a suite of ten 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.
 
Larvikite is a protective and grounding stone. It cleans the subtle bodies and facilitates a strong connection with the energies of Earth, helping to connect with the spirits of Nature.