mineral
Chalcedony Geode
Silicon dioxide, SiO2
AI-generated identification · may be incorrectMohs hardness of 6.5-7, waxy to vitreous luster, cryptocrystalline structure, conchoidal fracture, and specific gravity around 2.6.
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Physical properties
Mohs hardness of 6.5-7, waxy to vitreous luster, cryptocrystalline structure, conchoidal fracture, and specific gravity around 2.6.
Formation & geological history
Formed via the precipitation of silica-rich groundwater inside cavities of volcanic or sedimentary rocks over millions of years.
Uses & applications
Widely utilized in decorative carvings, cabochons, jewelry, and highly sought after by mineral and crystal collectors.
Geological facts
The botryoidal, bulbous interior texture is characteristic of rapid colloidal silica deposition within gas bubbles in host rock.
Field identification & locations
Identify by its distinct waxy luster, lack of visible crystal faces, and hardness that easily scratches glass; found globally in volcanic regions.
