mineral

Tumbled jasper or agate

Microcrystalline quartz (SiO₂), likely jasper/chalcedony

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; opaque gray-brown with subtle cream banding, waxy to vitreous luster, and no visible cleavage. Its rounded shape and glossy surface indicate mechanical tumbling and polishing.

Identified September 2, 2026More mineral →

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Physical properties

Hardness 6.5–7 Mohs; opaque gray-brown with subtle cream banding, waxy to vitreous luster, and no visible cleavage. Its rounded shape and glossy surface indicate mechanical tumbling and polishing.

Formation & geological history

Formed when silica-rich groundwater filled cavities or replaced material in volcanic or sedimentary rocks; deposits range from ancient Precambrian to younger Cenozoic formations. The exact variety cannot be confirmed from the photograph alone.

Uses & applications

Commonly used for cabochons, beads, carvings, and decorative stone; durable enough for small ornamental objects but not typically high-value jewelry.

Geological facts

Jasper is opaque chalcedony colored by iron oxides and other impurities, while agate is usually translucent and distinctly banded. This specimen may be a low-contrast jasper–agate variety.

Field identification & locations

Identify by its fine texture, lack of cleavage, glassy/waxy polish, and inability to scratch with a steel knife; quartz should scratch ordinary glass. Common sources include Brazil, Madagascar, India, Uruguay, and the western United States.