metamorphic

Iron-stained quartz-rich rock, possibly ironstone or quartz-vein material

Quartz (SiO₂) with iron oxides/hydroxides; exact host rock cannot be determined from the image

AI-generated identification · may be incorrect

Rough, uneven specimen with pale quartz-like areas and rusty brown to golden staining; likely vitreous quartz grains mixed with earthy iron oxides. Quartz has Mohs hardness 7, but the specimen’s overall hardness and texture depend on its unidentified host rock.

Identified September 27, 2026More metamorphic →

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At a glance

Common name: Iron-stained quartz-rich rock, possibly ironstone or quartz-vein material
Scientific name: Quartz (SiO₂) with iron oxides/hydroxides; exact host rock cannot be determined from the image
Category: metamorphic
Identified: September 27, 2026
Method: Standard

AI Estimated Value

About $1–$15 for a common, unprepared hand specimen; value depends on confirmed composition, locality, and appearance.

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

Likely formed when silica-rich fluids filled fractures or altered rock, with later oxidation of iron-bearing minerals producing the rusty coloration. Its geological age and precise formation setting cannot be established visually.

Uses & applications

Quartz-rich material may be used as aggregate or collected as a specimen; this piece does not show obvious gem-grade quality.

Geological facts

Iron oxides such as goethite and hematite commonly create yellow, brown, or reddish staining on quartz-bearing rocks.

Field identification & locations

Look for hard, glassy quartz patches and rusty coatings; quartz should scratch glass. Similar material occurs in many quartz-vein and weathered iron-rich settings worldwide; laboratory testing is needed for a firm identification.