Where is Sunstone found?
Plagioclase Feldspar (Oligoclase 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
Known for its copper-bearing sunstone, which exhibits a unique range of colors including green, red, and schiller (aventurescence) in a single stone. Found in basalt flows.
Norway
Historically significant source, particularly for red and orange sunstone with hematite inclusions. Found in pegmatites and metamorphic rocks.
India
Produces sunstone with hematite inclusions, often from pegmatitic and metamorphic environments.
Tanzania
Known for producing sunstone with strong aventurescence.
Canada (Quebec)
Occurrences of sunstone have been noted in certain igneous and metamorphic terrains.
Russia
Found in various regions, often associated with igneous complexes.
Collecting tips
- Look for Igneous Rocks. Sunstone is most commonly found in mafic igneous rocks like basalt and andesite, or in some granitic pegmatites. Search in areas with exposed volcanic or intrusive igneous formations.
- Identify Placer Deposits. Due to its relative hardness and resistance to weathering, sunstone can accumulate in alluvial (river) or glacial deposits. Look in stream beds, gravel pits, and beach sands downstream from known occurrences.
- Observe for Schiller Effect. The most distinctive feature is the aventurescence. Rotate potential specimens under a light source to check for the characteristic metallic glitter or spangled effect. This is often best seen in direct sunlight.
- Check for Cleavage. Like all feldspars, sunstone exhibits two distinct cleavage planes at nearly 90 degrees. This can help differentiate it from quartz, which lacks cleavage.
- Consider Associated Minerals. In igneous environments, sunstone may be found alongside other feldspars, pyroxenes, amphiboles, and quartz. In placer deposits, it might be mixed with other durable minerals.
Quick Check
- Color:
- Yellow, orange, red, brown, or colorless with a metallic glitter (aventurescence).
- Luster:
- Vitreous to sub-vitreous, with a distinct spangled or metallic sheen.
- Streak:
- White
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