igneous
Larvikite
Monzonite
AI-generated identification · may be incorrectHardness 6 on Mohs scale; dark grey to black color with striking blue or silver schiller effect (labradorescence); vitreous luster; triclinic feldspar crystal structure.
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Physical properties
Hardness 6 on Mohs scale; dark grey to black color with striking blue or silver schiller effect (labradorescence); vitreous luster; triclinic feldspar crystal structure.
Formation & geological history
Formed from the slow cooling of alkali-rich magma in deep-seated plutons during the Permian period around 298 million years ago.
Uses & applications
Widely used as a popular dimension stone for architectural cladding, floor tiles, and high-end kitchen countertops.
Geological facts
Norway's national stone, Larvikite is famous for its unique feldspar crystals that refract light to produce a vibrant blue chatoyancy.
Field identification & locations
Easily identified in the field by its dark coarse-grained texture and flashing blue or silver crystal faces when rotated in sunlight.
