igneous
Larvikite
Monzonite / Anorthosite (Igneous Rock)
Hardness of 6 on the Mohs scale; color ranges from dark grey to black with striking blue or silver chatoyant schiller effects (labradorescence); vitreous to pearly luster; granular to massive crystal structure; specific gravity around 2.7 to 2.75.
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Physical properties
Hardness of 6 on the Mohs scale; color ranges from dark grey to black with striking blue or silver chatoyant schiller effects (labradorescence); vitreous to pearly luster; granular to massive crystal structure; specific gravity around 2.7 to 2.75.
Formation & geological history
Formed from the cooling of magma deep within the Earth's crust, specifically as a variety of monzonite intrusive igneous rock. It dates back to the Permian period, approximately 290 to 300 million years ago.
Uses & applications
Widely used as a decorative dimension stone for building facades, interior flooring, kitchen countertops, and ornamental objects or tumbled gemstones.
Geological facts
Larvikite is quarried almost exclusively in the Larvik region of Norway, making it a unique geological export. It was designated as a Global Heritage Stone Resource by the International Union of Geological Sciences.
Field identification & locations
Easily identified by its dark grey background and distinctive flashing blue or silver feldspar crystals when turned in the light. Common in architectural stonework and rock shops.
