metamorphic

Polished brecciated jasper (likely picture jasper)

Silica-rich microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and clay inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque, reddish-brown, cream, gray-green, and black banding with a waxy to vitreous polish. Massive microcrystalline quartz has no visible cleavage; specific gravity is roughly 2.5–2.7.

Identified September 21, 2026More metamorphic →

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At a glance

Common name: Polished brecciated jasper (likely picture jasper)
Scientific name: Silica-rich microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and clay inclusions
Category: metamorphic
Identified: September 21, 2026
Method: Standard

AI Estimated Value

About $5–$25 for a small polished specimen; distinctive large cabochons or highly patterned pieces may sell for $30–$100.

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

Formed when silica-rich fluids replaced or cemented fine sediment and breccia, with iron oxides producing the red-brown colors; the exact geological age depends on locality. This example is tumbled and polished.

Uses & applications

Used for cabochons, beads, carvings, ornamental objects, and lapidary collections; it has little industrial value compared with bulk quartz.

Geological facts

Jasper is an opaque variety of chalcedony or microcrystalline quartz, and its patterns commonly reflect sedimentary layering, fractures, and mineral replacement.

Field identification & locations

Identify it by its opaque patterned appearance, glassy polish, lack of cleavage, and resistance to scratching; common sources include Oregon, Utah, Idaho, Madagascar, and Australia. A steel file generally will not scratch it.