metamorphic

Light-colored metamorphic rock, likely quartzite

Quartzite, composed predominantly of recrystallized quartz (SiO₂)

AI-generated identification · may be incorrect

Pale tan to gray, granular and nonmetallic with a rough surface; quartz has Mohs hardness 7 and a trigonal crystal structure, but individual grains are not clearly visible. The image alone cannot confirm its identity or reliably assess cleavage or density.

Identified October 6, 2026More metamorphic →

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Physical properties

Formation & geological history

Quartzite forms when quartz-rich sandstone is recrystallized by heat and pressure during metamorphism; its age depends on the original sandstone and later metamorphic event.

Uses & applications

Used as building and decorative stone, aggregate, and, when attractive, in landscaping or collections.

Geological facts

Quartzite is generally harder and more resistant to weathering than its sandstone precursor.

Field identification & locations

Look for fused-looking quartz grains and a scratch-resistant surface; it is commonly found in metamorphic mountain belts worldwide. A small, ordinary specimen like this is typically worth about $1–$10, depending on provenance and appearance.