mineral

Likely tumbled jasper or agate

Microcrystalline quartz (SiO₂), possibly iron-rich jasper

AI-generated identification · may be incorrect

Opaque to weakly translucent, rounded and polished, with reddish-brown, purple, and dark banded coloration; Mohs hardness 6.5–7, vitreous-to-waxy luster, and no visible cleavage. The blurred image prevents confident distinction from similar quartz-rich stones.

Identified September 7, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich groundwater replaced or filled cavities in volcanic rock, with iron and other impurities producing the colors and bands; subsequent tumbling created the smooth shape. Formation may range from Paleozoic to Cenozoic depending on locality.

Uses & applications

Used as a decorative stone, cabochon, bead, paperweight, and inexpensive jewelry material; jasper and agate are popular lapidary rough.

Geological facts

Jasper is generally opaque, whereas agate is commonly translucent and distinctly banded; both are varieties of chalcedony, a microcrystalline form of quartz.

Field identification & locations

Check for glassy/waxy luster, conchoidal fracture, hardness sufficient to scratch ordinary glass, and lack of bubbles or uniform artificial color. Common sources include India, Brazil, Madagascar, Mexico, and the western United States.