mineral

Likely red-and-green jasper (rough pebble)

Microcrystalline quartz (SiO₂), colored by iron oxides; exact identification requires testing

AI-generated identification · may be incorrect

Opaque, dark green-gray with reddish patches and a dull to slightly waxy surface; quartz hardness about 6.5–7 Mohs, no visible cleavage, and conchoidal fracture when broken. The photo does not resolve its crystal structure or confirm composition.

Identified October 1, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids or sediments become silicified, with iron compounds producing red and green colors. Such material occurs in many ages and geological settings; this specimen’s age and source cannot be determined from the image.

Uses & applications

Attractive pieces are polished for cabochons, beads, and display; jasper is also collected as a lapidary rough.

Geological facts

Jasper is an opaque variety of chalcedony, unlike transparent varieties such as many agates. Red-green patterns are often marketed as fancy jasper, but appearance alone cannot establish a specific variety.

Field identification & locations

Look for opaque, fine-grained material with no visible crystals; a scratch test against glass can help assess quartz-like hardness, though it may damage the pebble. Jasper is found worldwide, including in silica-rich volcanic and sedimentary deposits.