sedimentary

Jasper (likely brecciated jasper)

Microcrystalline quartz, SiO₂; iron-oxide-stained chalcedony

AI-generated identification · may be incorrect

Opaque, mottled reddish-brown and gray, with a waxy to dull luster and no visible cleavage; Mohs hardness about 6.5–7. The small, irregular piece appears naturally fractured or tumbled.

Identified September 29, 2026More sedimentary →

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Physical properties

Opaque, mottled reddish-brown and gray, with a waxy to dull luster and no visible cleavage; Mohs hardness about 6.5–7. The small, irregular piece appears naturally fractured or tumbled.

Formation & geological history

Silica-rich fluids filled cavities and fractures, then iron oxides colored the chalcedony; jasper deposits form in many geological settings and span a wide range of ages.

Uses & applications

Used for beads, cabochons, ornamental objects, and lapidary collecting; this small rough piece has little industrial value.

Geological facts

Jasper is a variety of chalcedony, itself microcrystalline quartz; brecciated varieties contain angular fragments cemented by silica.

Field identification & locations

Look for opacity, hardness sufficient to scratch glass, and a fine-grained quartz texture; common worldwide in silica-rich volcanic and sedimentary terrains. The photo alone cannot confirm the exact variety.