mineral

Polished green jasper pebble

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with pale quartz or chalcedony veining

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; dark green, opaque, and typically waxy to glassy when polished. It has a cryptocrystalline quartz structure, no cleavage, and specific gravity around 2.5–2.7.

Identified August 16, 2026More mineral →

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Physical properties

Hardness about 6.5–7 Mohs; dark green, opaque, and typically waxy to glassy when polished. It has a cryptocrystalline quartz structure, no cleavage, and specific gravity around 2.5–2.7.

Formation & geological history

Jasper forms when silica-rich fluids cement or replace volcanic ash, sediments, or fractures; the green color commonly reflects chlorite, epidote, or other iron-bearing inclusions. Its age depends on locality, ranging from Precambrian to relatively young volcanic settings.

Uses & applications

Used for cabochons, beads, carvings, tumbled stones, and ornamental objects; rarely used as a minor decorative dimension stone.

Geological facts

The cream-colored lines are likely quartz/chalcedony veinlets or breccia infill. Green jasper can resemble serpentine, nephrite, or dyed stones, so visual identification alone is provisional.

Field identification & locations

Common in volcanic and hydrothermal terrains worldwide, including India, Madagascar, Australia, Brazil, and the western United States. A glass-scratch test and hardness comparison can help distinguish it from softer green rocks, but avoid damaging polished specimens.