Where is Labradorite found?
Plagioclase Feldspar (Labradorite variety)
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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. Large deposits of anorthosite containing labradorite are found here.
Finland
Known for producing high-quality labradorite with a full spectrum of colors, often called 'Spectrolite'.
Norway
Significant deposits, particularly in the Larvik area, where it is a major component of the igneous rock Larvikite (a monzonite containing abundant labradorite).
Madagascar
Produces good quality labradorite, often with strong labradorescence.
Russia
Deposits found in various regions.
United States
Occurrences in states like Oregon (Sunstone, which is an oligoclase-labradorite), New York (Adirondack Mountains anorthosite), and others.
Australia
Some occurrences reported.
Collecting tips
- Look in Mafic Igneous Rocks. Search for labradorite in outcrops of basalt, gabbro, and especially anorthosite. These rocks are typically dark-colored and coarse-grained.
- Observe for Labradorescence. The most distinctive feature is the play of colors. Rotate the sample under a light source to observe the iridescent flashes. This effect is often best seen on polished or fractured surfaces.
- Check for Cleavage. Examine broken surfaces for two distinct cleavage planes intersecting at nearly 90 degrees. Fine parallel striations (polysynthetic twinning) may also be visible on these surfaces.
- Consider Associated Minerals. Labradorite is often found with other mafic minerals like pyroxenes (augite), olivine, and magnetite.
- Field Identification. In the field, look for dark, often massive rocks with a distinctive metallic or pearly luster on fresh breaks, and try to catch the iridescent flash by tilting the sample.
Quick Check
- Color:
- Dark gray to black with iridescent flashes (labradorescence).
- Luster:
- Vitreous to pearly.
- Streak:
- White.
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