metamorphic

Weathered, quartz-rich rock (possibly quartzite)

Quartzite, composed predominantly of quartz (SiO₂); identification is uncertain from the photo

AI-generated identification · may be incorrect

Pale gray-green with white, irregular patches and a dull, weathered surface. Quartz has Mohs hardness 7, a hexagonal crystal structure, no cleavage, and vitreous luster on fresh surfaces; the specimen’s texture and composition cannot be confirmed from the image.

Identified October 15, 2026More metamorphic →

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Physical properties

Formation & geological history

Quartzite forms when quartz sandstone is recrystallized by heat and pressure during metamorphism. Its age and geological setting cannot be determined from the photograph.

Uses & applications

Quartzite is used as crushed aggregate, paving and building stone, and sometimes as decorative stone; this small, weathered piece appears mainly suitable for collecting.

Geological facts

A useful field clue for quartzite is that it commonly breaks through quartz grains rather than around them, unlike many sandstones.

Field identification & locations

The specimen is clearly a natural rock, but its pale mottling alone is not enough to distinguish quartzite from other quartz-rich rocks. Look for a hard, gritty or glassy texture and test whether it scratches glass; avoid destructive testing on a valuable specimen.