Where is Serpentine found?
Mg3Si2O5(OH)4
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Open the appSerpentine 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 Serpentine
California, USA
Extensive serpentinite belts, particularly in the Coast Ranges and Sierra Nevada foothills, where it is the state rock. Associated with ophiolite complexes.
Appalachian Mountains, USA
Occurs in numerous localities from Georgia to Newfoundland, associated with ancient oceanic crust remnants.
The Alps, Europe
Well-known for serpentinite occurrences, particularly in Italy, Switzerland, and Austria, related to Alpine orogeny.
Urals Mountains, Russia
Significant deposits of serpentinite and associated minerals.
Quebec, Canada
Historically a major source of chrysotile asbestos, particularly in the Thetford Mines region.
Cyprus
Part of the Troodos Ophiolite, a classic example of oceanic crust and mantle exposed on land.
Collecting tips
- Look for Ultramafic Rock Associations. Serpentine is almost exclusively found in areas where ultramafic rocks (dark, dense igneous rocks rich in magnesium and iron, like peridotite or dunite) have been altered. Look for outcrops of these rocks.
- Identify Green, Greasy Rocks. Serpentine often has a distinctive olive-green to dark green color and a greasy or waxy luster. It feels smooth and sometimes soapy to the touch.
- Check for Veins and Fractures. Serpentine often forms in veins or as massive bodies within altered ultramafic rocks. Look for areas with extensive fracturing and hydrothermal alteration.
- Be Aware of Asbestos Varieties. If you encounter fibrous serpentine (chrysotile), exercise extreme caution. Do not disturb or collect it without proper safety equipment and knowledge of asbestos handling protocols. It is best to avoid collecting fibrous forms altogether.
Quick Check
- Color:
- Green (various shades), yellowish, brownish, black
- Luster:
- Greasy, waxy, silky, dull
- Streak:
- White
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