mineral
Polished stone sphere, possibly agate or jasper
Likely microcrystalline quartz (SiO₂); exact variety cannot be confirmed from the image
AI-generated identification · may be incorrectSmooth, polished, mottled tan, brown, gray, and greenish colors with a vitreous-to-waxy luster. If quartz-rich, hardness is about 6.5–7 Mohs; crystal structure is trigonal, though crystals are microscopic.
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Physical properties
Smooth, polished, mottled tan, brown, gray, and greenish colors with a vitreous-to-waxy luster. If quartz-rich, hardness is about 6.5–7 Mohs; crystal structure is trigonal, though crystals are microscopic.
Formation & geological history
If agate or jasper, it formed as silica-rich material filled cavities or replaced host rock, commonly in volcanic settings. Its geological age and exact source cannot be determined visually.
Uses & applications
Decorative sphere, collectible, or paperweight; agate and jasper are also used for carvings and jewelry.
Geological facts
The rounded shape and glossy surface are produced by cutting and polishing; they do not indicate the stone’s natural form.
Field identification & locations
Look for natural color banding, fine-grained texture, and hardness sufficient to resist scratching by a steel blade. Similar polished spheres are sold in many sizes and may be made from several different rocks or minerals.
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