metamorphic
Polished green jasper (likely ocean jasper or serpentine-rich jasper)
Microcrystalline quartz (SiO₂) with green chlorite/serpentine and iron-oxide inclusions
AI-generated identification · may be incorrectHardness about 6.5–7 Mohs for jasper; opaque, green with tan, cream, and brown mottling; dull to waxy luster and no visible cleavage. The rounded, glossy surface indicates tumbling and polishing.
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Physical properties
Hardness about 6.5–7 Mohs for jasper; opaque, green with tan, cream, and brown mottling; dull to waxy luster and no visible cleavage. The rounded, glossy surface indicates tumbling and polishing.
Formation & geological history
Forms when silica-rich fluids cement or replace volcanic sediment and breccia, with green coloring from chlorite, epidote, or serpentine; iron oxides create brown zones. Exact locality and geological age cannot be determined from the image.
Uses & applications
Used for cabochons, beads, carvings, worry stones, and decorative objects; generally a collector and lapidary material rather than a construction stone.
Geological facts
The specimen is probably not a single pure mineral but a fine-grained aggregate. “Ocean jasper” is a trade name often applied to orbicular or brecciated jasper from Madagascar, though this piece lacks enough diagnostic detail for confirmation.
Field identification & locations
Identify by its opaque mottled pattern, glassy polish, and lack of cleavage; jasper will not show transparent quartz crystals. Common sources include Madagascar, Mexico, Brazil, India, and Australia.
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