metamorphic

Quartz-rich metamorphic rock (likely quartzite)

Quartzite, composed predominantly of quartz (SiO₂), with minor iron-oxide and mica impurities

AI-generated identification · may be incorrect

Hardness about 7 Mohs; pale cream to tan, granular and sugary texture, vitreous to dull luster, and no obvious cleavage. The specimen appears compact and strongly quartz-rich, with rusty brown staining from iron oxides.

Identified September 1, 2026More metamorphic →

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At a glance

Common name: Quartz-rich metamorphic rock (likely quartzite)
Scientific name: Quartzite, composed predominantly of quartz (SiO₂), with minor iron-oxide and mica impurities
Category: metamorphic
Identified: September 1, 2026
Method: Standard

AI Estimated Value

Approximately $2–$15 for a small common specimen; $20–$75 or more for attractive, polished, or locality-labeled pieces.

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

Forms when quartz-rich sandstone is subjected to elevated temperature and pressure, recrystallizing its grains; commonly associated with mountain-building metamorphism, with age varying by locality. Exact age and locality cannot be determined from the photograph.

Uses & applications

Used as crushed stone, aggregate, landscaping rock, building stone, countertops, and decorative specimens; attractive pieces may be polished for ornamental use.

Geological facts

Quartzite is generally harder and more resistant to weathering than its sandstone precursor. Unlike marble, it typically does not fizz with dilute hydrochloric acid.

Field identification & locations

Common in metamorphic belts worldwide, including the Appalachians, Rocky Mountains, Alps, India, and Brazil. Field identification relies on quartz-rich composition, hardness, fused grains, and resistance to scratching by steel; a definitive identification may require testing.