Where is Labradorite found?
Labradorite (a variety of Anorthite, a plagioclase feldspar)
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Open the appLabradorite 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 Labradorite
Labrador, Canada
The type locality, where it was first discovered in 1770 by Moravian missionaries. Known for producing high-quality material.
Finland
Produces a highly prized variety known as Spectrolite, which exhibits a full spectrum of colors due to a finer lamellar structure.
Norway
Significant deposits, particularly in the Larvik region, where it is found in a rock called Larvikite (a monzonite containing abundant labradorite).
Madagascar
A major source of gem-quality labradorite.
Russia
Deposits found in various regions.
United States
Occurrences in states like Oregon (often with aventurescence, sometimes called Oregon Sunstone), New York, and others.
Australia
Some occurrences reported.
Collecting tips
- Look for Mafic Igneous Rocks. Labradorite is common in dark-colored igneous rocks like gabbro, basalt, and especially anorthosite. Focus your search in areas known for these rock types.
- Observe the Schiller Effect. The most distinctive feature is labradorescence. Rotate suspected samples under a light source to observe flashes of iridescent color. This effect is often best seen on freshly broken or polished surfaces.
- Check for Cleavage. Feldspars, including labradorite, exhibit good cleavage. Look for flat, reflective surfaces that break along distinct planes, often at nearly right angles.
- Consider Associated Minerals. In anorthosite, labradorite is the dominant mineral. In gabbro or basalt, it will be associated with pyroxenes (e.g., augite) and olivine.
- Examine Rock Outcrops. Large anorthosite intrusions can form significant rock masses. Look for these in geological maps of potential areas.
Quick Check
- Color:
- Gray to dark gray with iridescent flashes (labradorescence)
- Luster:
- Vitreous to pearly
- Streak:
- White
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