Where is Blue Opal found?
Opal (variety: Blue Opal)
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Open the appBlue Opal 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 Blue Opal
Peru
The most significant source of high-quality blue opal, particularly from the Andes Mountains. Often referred to as Peruvian Blue Opal or Andean Opal. Found in volcanic host rocks.
Oregon, USA
Some blue opal occurrences, often associated with volcanic activity.
Indonesia
Limited occurrences of blue opal, sometimes associated with petrified wood.
Nevada, USA
Certain localities yield common opal with blue hues.
Collecting tips
- Look for Volcanic Terrains. Focus your search in areas with past or present volcanic activity, as these environments are conducive to opal formation.
- Examine Fractures and Cavities. Opal often forms in voids, cracks, and fissures within host rocks. Look for these features in exposed rock faces or weathered material.
- Identify Associated Minerals. Opal can be found alongside other silica minerals like chalcedony or quartz, and sometimes with copper minerals if the blue color is due to chrysocolla inclusions.
- Check for Waxy Luster. Even in rough form, opal can exhibit a distinctive waxy to resinous luster, especially on freshly broken surfaces.
- Consider Weathering. Weathering can expose opal deposits. Look for areas where host rocks are eroding, potentially revealing opal nodules or veins.
Quick Check
- Color:
- Pale to deep blue, uniform
- Luster:
- Waxy to vitreous
- Streak:
- White
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