mineral
Tumbled green jasper (possibly serpentine)
Jasper, an opaque microcrystalline variety of quartz (SiO₂); exact identification is uncertain from the image
AI-generated identification · may be incorrectRounded, polished olive-green to yellow-brown stone with a mottled appearance and dull-to-waxy luster. If jasper, hardness is about 6.5–7 Mohs and its quartz crystals are microscopic; serpentine, another possibility, is softer (about 2.5–5.5).
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Physical properties
Rounded, polished olive-green to yellow-brown stone with a mottled appearance and dull-to-waxy luster. If jasper, hardness is about 6.5–7 Mohs and its quartz crystals are microscopic; serpentine, another possibility, is softer (about 2.5–5.5).
Formation & geological history
Jasper forms when silica-rich fluids fill or replace rock, commonly producing iron-colored patterns; serpentine forms through alteration of magnesium-rich ultramafic rocks. These processes span many geological ages.
Uses & applications
Tumbled specimens are used in jewelry, crafts, and collecting; jasper is also cut for ornamental objects.
Geological facts
Polishing can make several visually similar green stones difficult to distinguish from a photograph alone.
Field identification & locations
The smooth, rounded surface indicates tumbling or natural abrasion. Hardness testing or examination of a fresh surface would help distinguish quartz-rich jasper from softer serpentine.
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