metamorphic

Iron-stained quartz-rich rock, possibly quartzite or silicified breccia

Quartz (SiO₂)-dominant rock with iron-oxide minerals, chiefly hematite/goethite

AI-generated identification · may be incorrect

Likely Mohs hardness 6.5–7; gray to brown with white translucent quartz patches, rusty red staining, vitreous to dull luster, and no obvious cleavage. The irregular texture and cavity suggest brecciation or later silica mineralization.

Identified September 13, 2026More metamorphic →

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At a glance

Common name: Iron-stained quartz-rich rock, possibly quartzite or silicified breccia
Scientific name: Quartz (SiO₂)-dominant rock with iron-oxide minerals, chiefly hematite/goethite
Category: metamorphic
Identified: September 13, 2026
Method: Standard

AI Estimated Value

Approximately $5–$30 as an ordinary hand specimen; $30–$100 or more if unusually attractive, locality-labeled, or polished.

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

Probably formed when silica-rich fluids cemented or recrystallized fractured rock, with subsequent oxidation producing hematite/goethite staining. Its exact geological age and locality cannot be determined from the photograph.

Uses & applications

Used mainly as a decorative or collecting specimen; if sufficiently massive and attractive, it may be cut or polished. It has little industrial value without confirmed purity and deposit-scale quantity.

Geological facts

The white areas may be quartz veins or silicified fragments, while the reddish-brown material is likely iron oxide. A glass-scratch test and acid test can help distinguish quartz-rich rock from carbonate rock.

Field identification & locations

Common in hydrothermal veins, iron-rich zones, breccias, and weathered mineral deposits worldwide. Look for quartz that scratches glass, lack of fizz with dilute hydrochloric acid, and a reddish streak or earthy coating from iron oxides.