metamorphic

Iron-stained quartzite cobble (possibly hematitic quartzite)

Quartzite, composed chiefly of quartz (SiO₂), with iron oxides such as hematite (Fe₂O₃) staining or cementing it

AI-generated identification · may be incorrect

The image shows a rounded, mottled rusty-brown, cream, and gray rock with a granular, fractured surface. Quartz is Mohs 7, glassy to dull, and lacks cleavage; the specimen’s exact hardness, density, and mineral proportions cannot be confirmed visually.

Identified September 29, 2026More metamorphic →

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At a glance

Common name: Iron-stained quartzite cobble (possibly hematitic quartzite)
Scientific name: Quartzite, composed chiefly of quartz (SiO₂), with iron oxides such as hematite (Fe₂O₃) staining or cementing it
Category: metamorphic
Identified: September 29, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a common cobble; more only if verified, unusually attractive, or locality-significant.

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

Quartz-rich sandstone recrystallized during metamorphism, with iron oxides producing the rusty coloration. Its age and formation locality cannot be determined from the photograph.

Uses & applications

Quartzite is used as aggregate, paving and building stone, and decorative material; attractive pieces may be collected, though this cobble appears more geological than gem quality.

Geological facts

The image label suggests “hematite,” “quartzite,” or an iron/quartz cobblestone; rusty color alone does not establish hematite as a major mineral.

Field identification & locations

Look for interlocking quartz grains and a hard surface that scratches glass; unlike sandstone, quartzite commonly fractures through grains rather than around them. Similar cobbles occur in stream and glacial deposits, but location is unknown.