igneous
Larvikite
Monzonite (intermediate intrusive igneous rock containing plagioclase, alkali feldspar, and minor dark minerals)
Hardness: 6-6.5; Color: Dark grey to bluish-black with silvery or blue sheen; Lustre: Vitreous to pearly; Crystal structure: Monoclinic/Triclinic; Specific gravity: 2.6-2.8; Notable for its schiller effect (Labradorescence).
- Hardness
- 6-6
- Color
- Dark grey to bluish-black with silvery or blue sheen
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Physical properties
Hardness: 6-6.5; Color: Dark grey to bluish-black with silvery or blue sheen; Lustre: Vitreous to pearly; Crystal structure: Monoclinic/Triclinic; Specific gravity: 2.6-2.8; Notable for its schiller effect (Labradorescence).
Formation & geological history
Formed through the slow cooling of magma deep underground (plutonic) within the Larvik Plutonic Complex in Norway. It dates back to the Permian period, approximately 290 million years ago.
Uses & applications
Extensively used as an ornamental stone in architecture (building facades, countertops), commercial signage, monuments, and as tumbled stones for metaphysical/jewelry purposes.
Geological facts
Also known as 'Black Moonstone' or 'Blue Pearl Granite' despite not being a true granite. It is the national rock of Norway and is famous for the 'blue flash' that occurs when light hits the feldspar crystals at specific angles.
Field identification & locations
Identify by looking for 'schiller' flash in a dark grey matrix. It is commonly found in the Larvik region of Norway. For collectors, look for high contrast between the dark host and the bright blue/silver reflective patches.
