metamorphic

Iron-stained quartz-rich rock, possibly brecciated quartzite

Quartzite (SiO₂), with iron-oxide staining; exact identification is uncertain from the image alone

AI-generated identification · may be incorrect

Mottled cream, reddish-brown, and ochre surface with a glassy-to-dull luster and apparent granular texture. Quartz has Mohs hardness 7; quartzite is typically hard and lacks cleavage, but the specimen’s texture and mineral grains are not clear enough to confirm.

Identified September 30, 2026More metamorphic →

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At a glance

Common name: Iron-stained quartz-rich rock, possibly brecciated quartzite
Scientific name: Quartzite (SiO₂), with iron-oxide staining; exact identification is uncertain from the image alone
Category: metamorphic
Identified: September 30, 2026
Method: Standard

AI Estimated Value

About $1–$15 for a common hand-sized rough specimen; higher prices require verified provenance or notable features.

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

Quartzite forms when quartz-rich sandstone is recrystallized by heat and pressure during metamorphism; iron oxides can stain it red and brown. Its age and specific formation environment cannot be determined from the photograph.

Uses & applications

Quartzite is used as crushed stone, building and landscaping stone, and sometimes as decorative material; this rough specimen appears primarily collectible or ornamental.

Geological facts

Iron-oxide coatings can create vivid rusty colors on otherwise pale, quartz-rich rocks.

Field identification & locations

Look for a hard, interlocking quartz texture and grains that do not easily scratch or crumble; a hardness test and fresh broken surface would help distinguish quartzite from iron-stained quartz or another rock. Quartzite occurs worldwide in metamorphic terrains.