metamorphic

Iron-stained quartz-rich rock (likely limonite-bearing quartzite)

Quartzite, predominantly quartz (SiO₂), with iron oxides/hydroxides such as limonite/goethite

AI-generated identification · may be incorrect

Brown to ochre, rough and granular with rusty staining; quartz has Mohs hardness 7 and vitreous luster, while iron coatings are dull. The photo does not show enough detail to confirm texture or mineral proportions.

Identified September 23, 2026More metamorphic →

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At a glance

Common name: Iron-stained quartz-rich rock (likely limonite-bearing quartzite)
Scientific name: Quartzite, predominantly quartz (SiO₂), with iron oxides/hydroxides such as limonite/goethite
Category: metamorphic
Identified: September 23, 2026
Method: Standard

AI Estimated Value

About $1–$15 for a common hand-sized specimen; more if a confirmed, attractive locality specimen.

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 may be metamorphosed into quartzite, while iron-bearing fluids or weathering produce the ochre coating. Its age and exact formation environment cannot be determined from the image.

Uses & applications

Similar material is used as aggregate, landscaping stone, and sometimes building stone; this specimen appears primarily of modest collecting interest.

Geological facts

The rusty color commonly comes from iron oxides rather than the main rock-forming mineral. Quartzite is typically very hard and resists scratching by a steel knife.

Field identification & locations

Look for interlocking quartz grains and a hardness that can scratch glass; iron staining alone is not diagnostic. Quartzite occurs worldwide, but a closer examination or scratch test is needed to identify this specimen confidently.