mineral

Polished brown jasper pebble

Jasper, an opaque microcrystalline variety of quartz (SiO₂)

AI-generated identification · may be incorrect

Typically Mohs 6.5–7, with a waxy to vitreous polish and opaque brown, ochre, and dark-gray patterning; its quartz crystals are too fine to see, and it has no obvious cleavage. The photo alone cannot confirm the exact material.

Identified October 16, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids fill or replace rock, with iron and other impurities producing its colors; deposits occur in varied geological settings and ages.

Uses & applications

Used for polished ornaments, beads, cabochons, and other lapidary items; it has little industrial value compared with common quartz.

Geological facts

Jasper is valued for its distinctive color patterns, and “jasper” describes a broad range of opaque, patterned microcrystalline quartz rather than one unique composition.

Field identification & locations

Look for hardness near 7, opacity, and a smooth polish; the pictured rounded, glossy pebble may be tumbled. Jasper is found worldwide, but visual identification cannot establish its source or rule out other brown stones.