mineral

Polished banded jasper (likely ocean jasper or brecciated jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide impurities

AI-generated identification · may be incorrect

Opaque, fine-grained, typically Mohs hardness 6.5–7; the specimen shows muted red, brown, gray, and greenish bands with a dull-to-waxy polished luster. Quartz has a trigonal crystal structure, but individual crystals are microscopic; cleavage is absent and fracture is conchoidal to uneven.

Identified September 13, 2026More mineral →

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At a glance

Common name: Polished banded jasper (likely ocean jasper or brecciated jasper)
Scientific name: Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide impurities
Category: mineral
Identified: September 13, 2026
Method: Standard

AI Estimated Value

Approximately $5–$30 for a small polished piece; $30–$100+ for unusually attractive patterns, verified locality, or artisan workmanship.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic ash, sediments, or breccia, with iron and other minerals producing the colors and banding. Its exact geological age and variety cannot be determined from the image.

Uses & applications

Used for cabochons, carvings, beads, ornamental objects, and polished collecting specimens; low-grade material is sometimes used decoratively. Typical value is modest unless the pattern, locality, or polish is exceptional.

Geological facts

The visible layered texture and opaque coloration favor jasper over agate, which is usually more translucent. Green tones may reflect chlorite or other secondary minerals, while red and brown tones commonly come from hematite or goethite.

Field identification & locations

Field identification: opaque silica-rich material, waxy surface, hardness sufficient to scratch glass, and no obvious cleavage; avoid confusing it with dyed stone or slag. Common sources include Madagascar, India, Brazil, Mexico, and the western United States.