Where is Plume Agate found?
Chalcedony (cryptocrystalline quartz) with inclusions
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Open the appPlume Agate 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 Plume Agate
Oregon, USA
Known for exceptional Plume Agate, particularly from areas like Prineville and Madras, often found in rhyolitic and basaltic flows. Varieties include 'Biggs Jasper' (a misnomer, it's a plume agate) and 'Graveyard Point Plume Agate'.
Mexico
Various localities produce Plume Agate, often with vibrant red and orange plumes, associated with volcanic activity.
Indonesia
Known for unique Plume Agate varieties, sometimes with intricate patterns and diverse colors, often associated with ancient volcanic activity.
Brazil
Produces various forms of agate, including some with plume-like inclusions, typically from basaltic flows.
Australia
Certain regions yield Plume Agate, often with earthy tones, found in volcanic and sedimentary contexts.
Collecting tips
- Target Volcanic Terrains. Focus your search on areas with ancient or recent volcanic activity, particularly where basalt, rhyolite, or andesite are present. Look for weathered outcrops or stream beds that might contain eroded nodules.
- Look for Geodes and Amygdules. Plume Agate often forms within these spherical or almond-shaped cavities. Look for rounded, often bumpy, rocks that feel heavier than typical host rock.
- Check for Veins. Examine rock exposures for silica-filled veins, which can also host Plume Agate. These may appear as lighter-colored bands cutting through darker host rock.
- Examine Weathered Surfaces. The outer rind of agate nodules can be dull and uninteresting. Look for areas where the rock has been broken or chipped to reveal the internal patterns. Carry a spray bottle with water to wet surfaces, which enhances visibility of patterns.
- Safety Precautions. Always obtain permission before collecting on private land. Be aware of your surroundings, especially in rugged terrain. When breaking rocks, wear appropriate eye protection (safety glasses) and gloves. Be mindful of potential silica dust if cutting or grinding specimens, and use proper ventilation and respiratory protection (e.g., N95 mask) to prevent silicosis.
Quick Check
- Color:
- Variable, but always with distinct feathery or plume-like inclusions.
- Luster:
- Waxy to vitreous.
- Streak:
- White.
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