metamorphic

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with mica or feldspar

AI-generated identification · may be incorrect

Light gray, coarse-grained, and weakly foliated or banded, with a dull to subtly sparkling luster. Quartz has Mohs hardness 7, no cleavage, and quartzite commonly has specific gravity around 2.6–2.7.

Identified August 31, 2026More metamorphic →

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At a glance

Common name: Quartz-rich metamorphic rock, likely quartzite
Scientific name: Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with mica or feldspar
Category: metamorphic
Identified: August 31, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 for a small ordinary specimen; attractive, well-crystallized or locality-labeled pieces may sell for $15–$50.

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 recrystallized under metamorphic heat and pressure, commonly during mountain building. Its exact geological age cannot be determined from the photograph.

Uses & applications

Used as crushed aggregate, road stone, building stone, landscaping material, and occasionally as a decorative slab or specimen.

Geological facts

Quartzite is generally harder and more resistant to weathering than its sandstone precursor; broken surfaces commonly cut across, rather than around, original sand grains.

Field identification & locations

Identify it by its gritty crystalline texture, high hardness, and inability to scratch easily with a steel knife; unlike sandstone, grains are fused and the rock typically does not crumble. Common in metamorphic mountain belts worldwide.