What is Larvikite?


Larvikite is a variety of monzonite, notable for the presence of thumbnail-sized crystals of feldspar. It’s primarily found in the Larvik area of Norway, hence its name. Larvikite is often used as a decorative building material as well as a gemstone.

Larvikite is a unique gemstone that comes in shades of grey with blue or silver flashes. Its unique appearance and color make it a popular choice for countertops and decorative items, as well as jewelry like pendants and beads.

Gemstone Properties

Chemical ClassificationInorganic - Silicate
ColorPredominantly grey with blue or silver reflections.
LusterVitreous to pearly.
OccurrencePrimarily found in the Larvik Fjord region of Norway.
FormationFormed during the cooling of magma chambers.
Mohs Hardness6 - 6.5.
Specific GravityApproximately 2.55 - 2.75.
Diagnostic PropertiesBlue to silver labradorescence.
Chemical CompositionAnorthoclase (Na,K)AlSi3O8 and Augite (Ca,Na)(Mg,Fe,Al)(Si,Al)2O6
PleochroismNot observable due to its opacity.
Crystal SystemMonoclinic
Optical PropertiesBiaxial (+)
Refractive IndexVaries due to mixture of minerals
BirefringenceVaries due to mixture of minerals
2V angleMeasured: 58°
DispersionNot typically noted due to its opacity.