mineral
Polished pink chalcedony (likely pink agate/geode)
Microcrystalline quartz, SiO₂; chalcedony with iron-bearing inclusions and possible druzy quartz
AI-generated identification · may be incorrectHardness 6.5–7; translucent pink to mauve with tan/brown internal banding or brecciation; waxy to vitreous luster; cryptocrystalline quartz, with no visible cleavage and conchoidal fracture. Specific gravity is typically about 2.58–2.64.
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Physical properties
Hardness 6.5–7; translucent pink to mauve with tan/brown internal banding or brecciation; waxy to vitreous luster; cryptocrystalline quartz, with no visible cleavage and conchoidal fracture. Specific gravity is typically about 2.58–2.64.
Formation & geological history
Silica-rich groundwater filled cavities and fractures in volcanic rock, depositing chalcedony and quartz in layers; iron impurities produced the pink, tan, and brown colors. Such agate-forming deposits commonly range from Cenozoic to older volcanic ages.
Uses & applications
Polished spheres are used as decorative and lapidary objects, paperweights, and mineral-collection pieces; chalcedony is also used for cabochons, beads, carvings, and ornamental stone.
Geological facts
The specimen appears polished and may be a cut-and-filled agate or geode fragment rather than a naturally solid sphere. Color enhancement, dye, resin filling, or surface coating is possible and cannot be confirmed from the image.
Field identification & locations
Identify by its glassy/waxy polish, translucent quartz body, curved internal banding, and hardness sufficient to scratch ordinary glass. Common sources include Brazil, Uruguay, Madagascar, India, Mexico, and the United States.
