mineral

Tumbled green jasper (probable serpentine-rich stone)

Jasper, microcrystalline quartz (SiO₂), possibly mixed with serpentine or chlorite

AI-generated identification · may be incorrect

Olive-brown, opaque, rounded and polished with waxy to subdued vitreous luster; likely hardness 6–7 Mohs if jasper, though softer serpentine-rich material may be 2.5–5.5. The visible dark linear bands appear natural veining or foliation rather than cleavage.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic or sedimentary material; serpentine forms by alteration of ultramafic rocks. These materials range from Precambrian to recent geological ages and commonly occur in hydrothermal or metamorphic terrains.

Uses & applications

Used for cabochons, tumbled stones, carvings, ornaments, and lapidary collections; generally not used as a major construction stone in this small polished form.

Geological facts

The specimen appears to be a polished/tumbled geological material, but exact identification requires testing or a fresh surface. “Green jasper” is a trade name covering several visually similar silica-rich rocks.

Field identification & locations

Common sources include India, Madagascar, Brazil, Australia, and the western United States. Check streak, hardness, translucency, and specific gravity; a gemological or Raman test can distinguish jasper from serpentine.