metamorphic

Iron-stained quartzite or weathered sandstone

Quartzite, predominantly quartz (SiO₂), possibly derived from sandstone; exact identification requires testing

AI-generated identification · may be incorrect

Brown, tan, and cream coloration from iron-oxide staining; granular to sugary texture with possible quartz-rich veins. Quartz hardness is about 7 Mohs, vitreous-to-dull luster, no cleavage, and typical specific gravity near 2.6; the specimen appears rounded and weathered.

Identified September 12, 2026More metamorphic →

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At a glance

Common name: Iron-stained quartzite or weathered sandstone
Scientific name: Quartzite, predominantly quartz (SiO₂), possibly derived from sandstone; exact identification requires testing
Category: metamorphic
Identified: September 12, 2026
Method: Standard

AI Estimated Value

Approximately $1–$10 as an ordinary hand specimen; more distinctive, labeled, or polished examples may sell for $10–$30.

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 when quartz-rich sandstone was compacted and recrystallized during regional metamorphism; iron-bearing fluids later produced the brown staining. Its precise geologic age and locality cannot be determined from the photograph.

Uses & applications

Quartzite is used as crushed stone, aggregate, building stone, and durable landscaping material; attractive pieces may be collected, though this specimen has little commercial value.

Geological facts

Quartzite generally breaks across quartz grains rather than around them and commonly resists scratching and weathering better than sandstone.

Field identification & locations

Common in metamorphic mountain belts worldwide, including the Appalachian Mountains, western North America, and Scandinavia. A steel nail should not scratch it; acid produces no reaction unless carbonate minerals are present, while a fresh fracture should look crystalline and quartz-rich.