Where is Peridot in Basalt found?
Olivine (variety Peridot) in Basalt
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Open the appPeridot in Basalt 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 Peridot in Basalt
San Carlos Apache Reservation, Arizona, USA
One of the most famous localities for peridot in basalt, particularly in volcanic bombs and lava flows. Known for producing gem-quality peridot.
Hawaii, USA
Commonly found in basaltic lavas and volcanic sands (e.g., Papakolea Green Sand Beach) on the Hawaiian Islands, especially on the Big Island.
St. John's Island (Zabargad Island), Egypt
Historically significant source of peridot, though the host rock is often peridotite rather than basalt, but related to mantle-derived processes.
Myanmar (Burma)
Produces high-quality peridot, often found in association with volcanic rocks, though primary deposits can be in peridotite.
Norway
Some occurrences of olivine in basaltic rocks are known.
Canary Islands, Spain
Volcanic islands with basaltic activity, where olivine crystals can be found.
Collecting tips
- Look in Volcanic Areas. Focus your search on areas with recent or active basaltic volcanism. Lava flows, volcanic bombs, and cinder cones are prime locations.
- Examine Weathered Basalt. Peridot is harder and more resistant to weathering than the basalt matrix. Look for areas where the basalt has weathered away, potentially exposing or concentrating peridot crystals.
- Check Stream Beds and Beaches. Erosion can transport peridot crystals from their basaltic source. Green sand beaches (like Papakolea) are a clear indicator, but stream beds draining volcanic areas can also yield loose crystals.
- Look for Green Specks. Scan the dark basalt for small, bright green inclusions. These are often the peridot crystals.
- Use a Hand Lens. A hand lens (10x magnification) will help in identifying the characteristic green color and vitreous luster of peridot within the fine-grained basalt.
Quick Check
- Color:
- Dark gray to black matrix with olive green inclusions.
- Luster:
- Dull to earthy for basalt, vitreous for peridot.
- Streak:
- White (for peridot, though rarely tested in situ); basalt streak is typically grayish-white to colorless.
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