metamorphic

Iron-stained quartzite or ironstone

Likely ferruginous quartzite, composed mainly of quartz (SiO₂) with iron oxides such as hematite and goethite

AI-generated identification · may be incorrect

Opaque, mottled rusty red, brown, and dark gray; likely Mohs hardness around 6–7 if quartz-rich, with a dull to earthy luster and no obvious cleavage. The photo alone cannot confirm its composition or exact rock type.

Identified October 4, 2026More metamorphic →

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At a glance

Common name: Iron-stained quartzite or ironstone
Scientific name: Likely ferruginous quartzite, composed mainly of quartz (SiO₂) with iron oxides such as hematite and goethite
Category: metamorphic
Identified: October 4, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a small, common hand specimen; higher values require distinctive appearance or confirmed provenance.

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

If quartzite, it formed when quartz-rich sandstone was compacted and recrystallized during metamorphism; iron oxides produce the rusty colors. Its age and precise formation environment cannot be determined from the image.

Uses & applications

Iron-rich varieties may be used as iron ore or decorative stone; this specimen appears more suitable for collecting than industrial use.

Geological facts

Rusty orange-red and brown coloration commonly comes from hematite or goethite coating or cementing the grains.

Field identification & locations

Look for a hard, granular texture and quartz grains that resist scratching by a steel knife; a definitive identification may require examination of a fresh surface or mineral testing. Ferruginous quartzite and ironstone occur widely worldwide.