Where is Sunstone found?
Plagioclase Feldspar (Oligoclase or Labradorite variety)
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Open the appSunstone 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 Sunstone
Oregon, USA
Famous for 'Oregon Sunstone,' which contains native copper inclusions, producing unique red, green, and bi-color effects. Found in basaltic lava flows in Harney and Lake Counties.
Norway
Historically significant source, particularly for oligoclase sunstone with hematite inclusions, found in pegmatites and metamorphic rocks.
India
Produces sunstone with hematite inclusions, often found in metamorphic terrains.
Tanzania
Known for sunstone with strong aventurescence, often with reddish-orange hues.
Canada
Occurrences in various provinces, often associated with anorthosite complexes.
Russia
Found in certain igneous and metamorphic rock formations.
Madagascar
Produces sunstone with good clarity and aventurescence.
Collecting tips
- Look for Igneous Rocks. Sunstone is most commonly found in mafic igneous rocks like basalt flows or in some granitic pegmatites. Search in areas known for these rock types.
- Identify the Schiller Effect. The most distinctive feature is the aventurescence. Rotate the specimen under a light source to observe the metallic glitter from the inclusions. This is key to distinguishing it from other feldspars.
- Check for Cleavage. Like all feldspars, sunstone exhibits two perfect cleavages at nearly 90 degrees. This can be observed on broken surfaces.
- Examine Inclusions. Under magnification, the platy inclusions (hematite, goethite, or copper) responsible for the schiller effect may be visible. Their orientation often aligns with crystallographic planes.
- Consider Geographic Location. Focus your search on known sunstone localities, such as the basalt fields of Oregon or pegmatite districts in Norway or India.
Quick Check
- Color:
- Yellow, orange, pink, red, reddish-brown, sometimes green or blue, with metallic glitter.
- Luster:
- Vitreous to sub-vitreous, with aventurescence.
- Streak:
- White
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