Where is Peridot found?
Olivine (Mg,Fe)2SiO4
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Open the appPeridot 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
San Carlos Apache Reservation, Arizona, USA
One of the most significant sources of gem-quality peridot, found in basaltic lava flows and volcanic bombs.
Zabargad Island (St. John's Island), Red Sea, Egypt
Historically important source, known for producing large, fine-quality peridot crystals from peridotite xenoliths.
Myanmar (Burma)
Produces high-quality peridot, often found in association with serpentine and other ultramafic rocks.
Pakistan
Known for producing fine, vibrant green peridot, particularly from the Supat Valley.
China
Significant producer of peridot, often found in basaltic rocks.
Vietnam
Emerging source of peridot, found in basaltic terrains.
Collecting tips
- Look in Volcanic Areas. Peridot is commonly found in basaltic lava flows and volcanic bombs, especially in areas with recent volcanic activity. Look for dark, vesicular volcanic rocks.
- Examine Ultramafic Rocks. In areas with exposed mantle rocks (peridotites, dunites), peridot can be a primary constituent. These rocks are often dark green to black.
- Check Alluvial Deposits. Due to its relative hardness and resistance to weathering, peridot can be found in placer deposits (riverbeds, gravels) downstream from its primary sources.
- Distinguish from Similar Minerals. Pay attention to the distinct yellowish-green color, vitreous luster, and lack of strong cleavage. Green garnets (e.g., grossular) are typically harder and have different crystal habits. Diopside often has better cleavage.
- Use a Magnifying Glass. Examine the crystal habit and internal features. Peridot often shows 'lily pad' inclusions (stress fractures) or chromite crystals.
Quick Check
- Color:
- Yellowish-green to green
- Luster:
- Vitreous to oily
- Streak:
- White
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