Where is Sunstone found?
Oligoclase (Plagioclase Feldspar)
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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, giving it a unique schiller and often bi-color or tri-color zones (red, green, yellow). Found in basalt flows in Harney and Lake Counties.
Norway
Historically significant source, particularly for material with hematite inclusions, found in pegmatites and metamorphic rocks.
India
Produces sunstone with hematite inclusions, often from pegmatitic and metamorphic environments.
Tanzania
Known for sunstone with strong aventurescence, often with red and orange hues.
Canada
Found in various locations, often associated with anorthosite complexes.
Russia
Occurrences reported in several regions.
Madagascar
Produces sunstone with good clarity and aventurescence.
Collecting tips
- Look for Igneous Rocks. Sunstone is most commonly found in igneous rocks, particularly basalt flows or certain granitic/syenitic intrusions. Search in areas known for these rock types.
- Identify Aventurescence. The key identifying feature is the internal glitter or schiller. Rotate the specimen under a light source to observe this effect. This distinguishes it from other feldspars.
- Check for Cleavage. Like all feldspars, sunstone exhibits two distinct cleavage planes at nearly 90 degrees. This can be observed on broken surfaces.
- Examine Inclusions. Under magnification, the tiny metallic inclusions (hematite, goethite, or copper) responsible for the aventurescence may be visible.
- Consider Associated Minerals. In basaltic environments, sunstone may be found with other minerals typical of such rocks, like pyroxenes or olivine. In granitic settings, it might be with quartz and other feldspars.
Quick Check
- Color:
- Yellow, orange, pink, red, green, often with metallic glitter.
- Luster:
- Vitreous with aventurescence (schiller).
- Streak:
- White
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