metamorphic

Iron-rich quartzite or silicified ironstone

Quartz (SiO₂) with iron oxides/hydroxides, likely limonite/goethite and possibly hematite

AI-generated identification · may be incorrect

Hardness approximately 6.5–7 for quartz, with softer earthy iron coatings; brown, golden, gray, and translucent areas, vitreous to dull luster, massive granular texture, and no obvious cleavage. The metallic-golden patches may be iron sulfide, but the image is insufficient for certainty.

Identified August 10, 2026More metamorphic →

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At a glance

Common name: Iron-rich quartzite or silicified ironstone
Scientific name: Quartz (SiO₂) with iron oxides/hydroxides, likely limonite/goethite and possibly hematite
Category: metamorphic
Identified: August 10, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a common hand specimen; $30–$100+ if it has vivid metallic minerals, strong translucency, or an attractive polished surface.

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 by silica-rich fluids cementing or metamorphosing iron-bearing sediment, followed by oxidation near the surface; age depends on its host formation and cannot be determined visually. Common in weathered quartz veins, iron formations, and hydrothermal zones.

Uses & applications

Primarily a collector specimen; ironstone and quartzite may be used as aggregate, dimension stone, or decorative stone, while attractive polished pieces can serve as ornamental material.

Geological facts

A streak test, hardness test, and specific-gravity measurement would help distinguish iron oxides from pyrite or chalcopyrite. Rust-brown coloration commonly reflects limonite/goethite rather than a single pure mineral.

Field identification & locations

Look for quartz-like fracture and scratch resistance, a brown/yellow streak, and local magnetism if magnetite is present; common in iron-rich districts worldwide. Avoid assuming it is gold from color alone.