Where is Epidosite found?
Epidote-rich rock
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Open the appEpidosite 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 Epidosite
Ophiolite Complexes Worldwide
Epidosite is a common component of altered oceanic crust found in ophiolite sequences, which are remnants of ancient oceanic lithosphere obducted onto continental margins. Examples include Cyprus, Oman, and parts of the Appalachian Mountains.
Alpine Orogeny Regions
Regions that have undergone significant Alpine-type metamorphism, such as the European Alps, often contain epidote-rich rocks derived from metabasalts and metagabbros.
Subduction Zones and Accretionary Wedges
Areas where oceanic crust is being subducted and metamorphosed, or where fragments of oceanic crust are incorporated into accretionary wedges, can host epidotized rocks.
Hydrothermal Alteration Zones
Associated with hydrothermal systems in various geological settings, including geothermal fields and areas of ore mineralization, where hot fluids have altered mafic rocks.
Collecting tips
- Look for Green Rocks in Metamorphic Terranes. Epidosite's distinctive green color is a key indicator. Focus your search in areas mapped as metamorphic belts, especially those with a history of mafic igneous protoliths.
- Examine Outcrops Near Ophiolites. If you are in a region known for ophiolite complexes, search for outcrops that show evidence of altered oceanic crust, such as metabasalts or metagabbros, which are common protoliths for epidosite.
- Check for Associated Minerals. Epidosite often occurs with quartz, chlorite, actinolite, and albite. The presence of these minerals can help confirm the identification and geological context.
- Consider Hydrothermal Veins. Epidote can also form in hydrothermal veins. Look for green, crystalline veins cutting through other rock types, particularly in areas of past volcanic or intrusive activity.
Quick Check
- Color:
- Pistachio-green to yellowish-green
- Luster:
- Vitreous to resinous
- Streak:
- White to grayish-white
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