Where is Sunstone found?
Oligoclase (variety of 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
Known for its copper-bearing sunstone, which can exhibit a range of colors including green and red, and often displays a strong aventurescence. Found in basalt flows.
Norway
Historically significant source, particularly for oligoclase sunstone with hematite inclusions.
India
Produces sunstone with hematite inclusions, often with a reddish-orange hue.
Tanzania
Known for producing sunstone with a good play of color.
Canada (Quebec)
Some occurrences of sunstone have been reported.
Russia
Ural Mountains region has produced sunstone.
Collecting tips
- Look for Igneous Rocks. Sunstone is frequently found in mafic igneous rocks like basalt and gabbro, or in pegmatites. Search in areas with exposed igneous formations.
- Examine for Aventurescence. The most distinctive feature is the metallic glitter. Rotate the specimen under a light source to observe the Schiller effect. This is crucial for identification.
- Check for Cleavage. Feldspars have characteristic cleavage planes. Look for two perfect cleavages intersecting at approximately 90 degrees.
- Consider Placer Deposits. Due to its durability, sunstone can be found in alluvial deposits (riverbeds, gravels) downstream from its primary source.
Quick Check
- Color:
- Orange, pink, red, yellow, or colorless with metallic glitter.
- Luster:
- Vitreous to sub-vitreous with aventurescence.
- Streak:
- White
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