Where is Larvikite found?
Monzonite (feldspar group)
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Open the appLarvikite occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Larvikite
Larvik Plutonic Complex, Norway
The primary and type locality for Larvikite, located in the Vestfold and Telemark counties of southeastern Norway. Extensive quarries operate in this region.
Other Rift Zones (rarely)
Similar rocks with iridescent feldspars can occur in other anorogenic rift-related igneous provinces globally, but true Larvikite, as defined by its specific mineralogy and petrogenesis, is unique to the Oslo Rift.
Collecting tips
- Observe Iridescence. The most distinctive feature is the strong blue, silver, or green schiller effect (labradorescence/peristerescence) from the large feldspar crystals. Rotate the sample under light to observe this play of color.
- Examine Grain Size. Larvikite is typically coarse-grained, with individual feldspar crystals often visible to the naked eye and frequently exceeding 1 cm in size.
- Check for Dark Minerals. Look for minor amounts of dark, mafic minerals (biotite, augite, hornblende) interspersed within the feldspar-rich matrix.
- Consider Geological Context. If found in situ, it will be part of a large intrusive igneous body, often associated with other alkaline igneous rocks.
Quick Check
- Color:
- Dark gray to black with iridescent blue/silver/green flashes.
- Luster:
- Vitreous to pearly on feldspar.
- Streak:
- White (due to feldspar content).
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