metamorphic

Weathered quartz-rich metamorphic rock, likely quartzite

Quartzite, composed predominantly of quartz (SiO₂), possibly with feldspar and mica impurities

AI-generated identification · may be incorrect

Hardness about 7 Mohs; pale gray-brown, coarse-grained, massive, and weakly sparkly with a vitreous to dull luster. Quartz grains are fused, giving high toughness and typically no obvious cleavage.

Identified September 7, 2026More metamorphic →

Explore Weathered quartz-rich metamorphic rock, likely quartzite in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Weathered quartz-rich metamorphic rock, likely quartzite
Scientific name: Quartzite, composed predominantly of quartz (SiO₂), possibly with feldspar and mica impurities
Category: metamorphic
Identified: September 7, 2026
Method: Standard

AI Estimated Value

Approximately $5–$30 as a common landscaping specimen; collectible or unusually patterned pieces may sell for $30–$100.

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

Hardness about 7 Mohs; pale gray-brown, coarse-grained, massive, and weakly sparkly with a vitreous to dull luster. Quartz grains are fused, giving high toughness and typically no obvious cleavage.

Formation & geological history

Formed when quartz-rich sandstone was subjected to heat and pressure, commonly during mountain building; its exact geological age cannot be determined from the photograph. The rounded surface reflects weathering and transport or landscaping use.

Uses & applications

Used as crushed stone, road aggregate, building stone, flagstone, and decorative landscape rock; attractive varieties are used for countertops and ornamental pieces.

Geological facts

Quartzite commonly breaks across grains rather than around them, unlike sandstone, and can scratch ordinary glass. The specimen’s strongly weathered appearance limits precise identification from an image alone.

Field identification & locations

Look for a hard, quartz-rich rock with fused grains and a sugary texture; a steel nail should not scratch it, while it may scratch glass. Common worldwide, especially in ancient mountain belts and metamorphic terrains.