mineral

Tumbled yellow jasper (likely silicified/iron-stained chert)

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides and darker inclusions

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; mustard-yellow to cream with gray-black mottling, waxy to dull luster, no visible cleavage, cryptocrystalline quartz structure; typically specific gravity about 2.6.

Identified August 26, 2026More mineral →

Explore Tumbled yellow jasper (likely silicified/iron-stained chert) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Tumbled yellow jasper (likely silicified/iron-stained chert)
Scientific name: Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides and darker inclusions
Category: mineral
Identified: August 26, 2026
Method: Standard

AI Estimated Value

Approximately $3–$15 for a common tumbled stone; $20–$75 for unusually attractive patterns or larger polished pieces.

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

Mohs hardness 6.5–7; mustard-yellow to cream with gray-black mottling, waxy to dull luster, no visible cleavage, cryptocrystalline quartz structure; typically specific gravity about 2.6.

Formation & geological history

Forms when silica-rich fluids replace or cement sedimentary material, with iron oxides producing the yellow coloration; the exact geological age cannot be determined from the photograph. Its rounded shape and glossy surface indicate human tumbling and polishing.

Uses & applications

Used for cabochons, beads, carvings, tumbling, ornamental stone, and small decorative objects; generally not used as a major construction stone.

Geological facts

Jasper is an opaque variety of chalcedony rather than a single mineral species; patterns and colors arise from impurities, replacement textures, and iron or manganese staining.

Field identification & locations

Identify it by its opaque, fine-grained appearance, hardness, waxy polish, and resistance to scratching by a steel knife; it should not show glassy quartz crystals or strong cleavage. Common sources include India, Brazil, Madagascar, Australia, and the western United States.