metamorphic

Quartz-rich rock (likely quartzite)

Quartzite, composed predominantly of quartz (SiO₂)

AI-generated identification · may be incorrect

Pale yellow-white, granular and crystalline with a vitreous-to-dull luster; quartz hardness is 7 Mohs, with no cleavage and irregular fracture. The image alone cannot confirm the rock’s texture or composition; iron staining may account for the yellow color.

Identified September 26, 2026More metamorphic →

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Physical properties

Formation & geological history

Typically forms when quartz-rich sandstone is recrystallized under heat and pressure during metamorphism. Such rocks occur across many geological ages and mountain belts.

Uses & applications

Quartzite is used as crushed stone, road aggregate, and building or decorative stone; this small specimen is mainly suitable for collecting.

Geological facts

Quartz grains in true quartzite are interlocked, making it notably resistant to weathering and difficult to scratch with a steel knife.

Field identification & locations

Look for fused, interlocking quartz grains and a lack of sandy layering; a fresh broken surface helps distinguish quartzite from loose quartz or quartz-rich sandstone. Common in metamorphic terrains worldwide.