Where is Labradorite found?
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 original and namesake locality, known for significant deposits, particularly in anorthosite intrusions.
Finland
Produces the highest quality, intensely iridescent variety known as Spectrolite, often from anorthosite bodies.
Madagascar
Important source of gem-quality labradorite.
Norway
Found in various igneous and metamorphic complexes.
Russia
Occurrences in mafic intrusions.
United States (e.g., Oregon, New York)
Oregon is known for sunstone, a variety of labradorite/oligoclase, while New York has anorthosite bodies containing labradorite.
Australia
Found in some igneous rock formations.
Collecting tips
- Look in Mafic Igneous Rocks. Target areas with known occurrences of gabbro, basalt, and especially anorthosite, as these are the primary host rocks for labradorite.
- Examine Cleavage Surfaces. The characteristic labradorescence is best observed on polished or freshly broken cleavage surfaces. Rotate the sample under a light source to catch the iridescent flash.
- Check for Polysynthetic Twinning. Fine, parallel striations (twinning lamellae) on cleavage surfaces are indicative of plagioclase feldspar and can help distinguish it from potassium feldspar.
- Consider Associated Minerals. Labradorite often occurs with pyroxenes (augite), olivine, and magnetite in mafic rocks.
- Safety Precautions. When collecting in the field, always wear appropriate safety gear, including eye protection and gloves. Be aware of your surroundings and potential hazards in geological environments. Labradorite itself is not hazardous, but the rocks it's found in can be heavy and sharp.
Quick Check
- Color:
- Gray to dark gray with iridescent flashes (labradorescence)
- Luster:
- Vitreous to pearly
- Streak:
- White
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