mineral

Tumbled green jasper or serpentine

Jasper: microcrystalline quartz (SiO₂); possible serpentine: Mg₃Si₂O₅(OH)₄

AI-generated identification · may be incorrect

Small polished/tumbled, opaque green-and-black specimen with a waxy to dull luster. Jasper has Mohs hardness 6.5–7; serpentine is softer at 2.5–5.5, so visual identification alone is uncertain.

Identified August 28, 2026More mineral →

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Physical properties

Small polished/tumbled, opaque green-and-black specimen with a waxy to dull luster. Jasper has Mohs hardness 6.5–7; serpentine is softer at 2.5–5.5, so visual identification alone is uncertain.

Formation & geological history

Green jasper forms when silica-rich fluids cement or replace volcanic material; serpentine forms by hydration and alteration of ultramafic rocks. These processes range from Precambrian to modern geological settings.

Uses & applications

Used as an ornamental stone, cabochon, bead, carving material, and inexpensive collectible; it has little industrial value in this small form.

Geological facts

The mottled appearance may also represent epidote-, chlorite-, or chrysoprase-bearing material sold commercially as green jasper. A hardness test and mineralogical analysis are needed for a definitive name.

Field identification & locations

Common sources include India, Madagascar, Brazil, Australia, and the western United States. Check streak, hardness, translucency, and specific gravity; avoid confusing it with dyed quartz or glass.