mineral
Plume Agate
Silicon Dioxide (SiO2) - Chalcedony Variety
AI-generated identification · may be incorrectHardness: 6.5 - 7 on Mohs scale. Color: Translucent grayish-pink to beige matrix with pink, brownish, and white feather-like or plume-like inclusions. Luster: Waxy to vitreous. Crystal structure: Trigonal (microcrystalline/cryptocrystalline). Cleavage: None (conchoidal fracture). Specific gravity: 2.58-2.64.
- Hardness
- 6
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5 - 7 on Mohs scale. Color: Translucent grayish-pink to beige matrix with pink, brownish, and white feather-like or plume-like inclusions. Luster: Waxy to vitreous. Crystal structure: Trigonal (microcrystalline/cryptocrystalline). Cleavage: None (conchoidal fracture). Specific gravity: 2.58-2.64.
Formation & geological history
Formed in volcanic host rocks through low-temperature hydro-thermal fluids precipitating silica within cavities and vesicles. The plume inclusions are created by mineral oxides and silicates forming delicate, branching structures before or during silica deposition.
Uses & applications
Popular in lapidary arts for cutting cabs, tumble-polishing, and making jewelry like pendants and rings. Highly sought after by mineral collectors for its unique organic patterns.
Geological facts
Plume agate gets its name from the feathery, flower-like, or plume-like inclusions that appear trapped inside the chalcedony matrix. Distinct variations like Graveyard Point plume agate and Pink Plume agate are famed among collectors.
Field identification & locations
Identified in the field by its waxy luster, conchoidal fracture, hard scratch resistance, and characteristic plume or moss-like internal pattern visible under light. Frequently found in regions with ancient volcanic activity like Oregon, Idaho, and Mexico.
