Where is Labradorite found?
Labradorite (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. Large deposits of anorthosite containing labradorite are found here.
Finland
Known for producing the highest quality labradorite, often called 'Spectrolite,' which exhibits a full spectrum of colors.
Norway
Significant deposits, particularly in the Larvik area, where a variety known as 'Larvikite' (a monzonite rock rich in labradorite) is quarried.
Madagascar
Produces large quantities of gem-quality labradorite.
Russia
Deposits found in various regions.
United States
Occurrences in states like Oregon (as Sunstone, a variety of oligoclase-andesine with aventurescence, sometimes confused with labradorite), and New York (in anorthosite).
Australia
Found in some igneous complexes.
Mexico
Known for some occurrences.
Collecting tips
- Look in Mafic Igneous Rocks. Search for labradorite in outcrops of gabbro, basalt, and especially anorthosite, where it can be a major rock-forming mineral.
- Observe for Labradorescence. Rotate potential specimens under natural light to observe the characteristic iridescent flashes of color. This is the most definitive visual identifier.
- Check Cleavage. Examine broken surfaces for the two distinct cleavage planes intersecting at nearly 90 degrees, typical of feldspars.
- Consider Associated Minerals. Labradorite often occurs with pyroxenes (e.g., augite), olivine, and magnetite in mafic rocks.
- Field Identification. While labradorescence is key, its dark gray to black base color and vitreous luster on fresh surfaces can help distinguish it from other common minerals in the field.
Quick Check
- Color:
- Dark gray to black with iridescent flashes (labradorescence)
- Luster:
- Vitreous to pearly
- Streak:
- White
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