Where is Prasiolite found?
Green Amethyst (Quartz variety)
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Open the appPrasiolite 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 Prasiolite
Montezuma, Minas Gerais, Brazil
One of the primary sources of naturally occurring prasiolite, though still rare. The amethyst from this region is known to turn green upon natural heating.
Thunder Bay, Ontario, Canada
Another known locality for natural prasiolite, where amethyst has been naturally altered to green.
Lower Silesia, Poland
A source of amethyst that can be heat-treated to produce prasiolite.
Arizona, USA
Some amethyst from certain localities in Arizona can also be heat-treated to produce prasiolite.
Collecting tips
- Look for Amethyst Deposits. Since most prasiolite is heat-treated amethyst, understanding where amethyst is found is key. Look for areas with hydrothermal quartz veins, pegmatites, and volcanic rock formations.
- Examine Color Carefully. Natural prasiolite often has a more subtle, sometimes slightly grayish-green hue compared to the often brighter, more uniform green of heat-treated material. However, this is not a definitive test.
- Check for Inclusions. Like other quartz varieties, prasiolite can contain various inclusions. These can sometimes help in identifying its origin, though they are not specific to prasiolite itself.
- Consider Geological Context. In areas known for natural prasiolite, look for evidence of past geothermal activity or igneous intrusions that could have provided the necessary heat for its formation.
Quick Check
- Color:
- Green (pale to deep, often yellowish-green)
- Luster:
- Vitreous
- Streak:
- White
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