igneous
Larvikite
Larvikite (Augite Syenite)
Hardness 6-6.5 (Mohs scale), dark gray to black color with a distinctive schiller or pearlescent luster, relatively coarse-grained crystal structure.
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Physical properties
Hardness 6-6.5 (Mohs scale), dark gray to black color with a distinctive schiller or pearlescent luster, relatively coarse-grained crystal structure.
Formation & geological history
Formed approx. 290 to 298 million years ago from the slow cooling of magma deep within the Earth's crust, primarily found in the Larvik region of Norway.
Uses & applications
Used widely in internal and external commercial building facing (like the UN building in New York), kitchen countertops, and ornamental objects or jewelry.
Geological facts
Also known as Black Moonstone or Blue Pearl Granite, though it is neither a true moonstone nor a granite. It was designated as the national rock of Norway in 2007.
Field identification & locations
Identified by its characteristic labradorescence (schiller effect) which flashes blue or silver. Mostly sourced from Norway.
