Volcano agate forms when silica-rich fluids fill cavities within volcanic rock, creating layers of chalcedony, agate banding, and occasional crystal-lined voids. Variations in mineral content during formation can produce contrasting colors, internal structures, and fluorescent zones visible under ultraviolet light.
This polished volcano agate sphere features deep charcoal-gray chalcedony accented by multiple natural druzy cavities and contrasting bands of translucent agate. A prominent crystal-lined opening extends across one side of the sphere, accompanied by a smaller druzy pocket and additional exposed mineral features throughout. Under ultraviolet light, portions of the agate fluoresce a vivid green, illuminating internal structures and translucent zones within the stone.
Selected for its substantial druzy exposure, strong contrast between polished agate and crystal-lined cavities, and pronounced UV-reactive character, this specimen presents a dramatic geological appearance from every angle.
Details:
- Volcano agate
- Approx. 2.9" diameter
- Polished sphere
- UV reactive (green fluorescence)
- Large natural druzy cavity
- Secondary druzy pocket present
- Natural variations in color, banding, and mineral inclusions
- Acrylic display stand included
A striking display specimen well suited for a cabinet of curiosities, mineral collection, or ultraviolet mineral display.
You will receive the exact piece shown.
Volcano Agate (UV Reactive) | Polished Specimen | 2.9"
Orders ship at a flat rate of $8 within the United States, with free U.S. shipping on orders over $50 (before tax). Due to the delicate and one-of-a-kind nature of curated specimens, returns and exchanges are not accepted. For full details on sourcing, care, and policies, see Notes from the Cabinet.