sedimentary

Weathered quartz-rich rock, likely sandstone or quartzite

Quartz sandstone (possibly weakly metamorphosed quartzite); predominantly SiO₂

AI-generated identification · may be incorrect

Tan-brown, rough and granular, with a dull to slightly glassy luster; likely quartz grains in a cemented matrix. Hardness is approximately 6–7 Mohs; cleavage absent, fracture uneven, and specific gravity about 2.6.

Identified September 12, 2026More sedimentary →

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Physical properties

Formation & geological history

If sandstone, it formed from deposited and cemented sand grains, commonly during a terrestrial or shallow-marine sedimentary period; if quartzite, later burial and heating recrystallized it. The image cannot establish a precise geological age.

Uses & applications

Sandstone is used for building stone, paving, aggregate, and decorative work; quartzite is used for countertops, facing stone, roads, and aggregate. This fragment has little jewelry value unless unusually pure or attractive.

Geological facts

Quartz-rich rocks commonly weather into resistant, angular fragments and may show visible sand grains or faint layering. The specimen’s small size and limited image detail prevent confident separation of sandstone from quartzite.

Field identification & locations

Look for individual rounded grains and bedding in sandstone; a fused, sugary texture with grains that do not scratch apart suggests quartzite. Common worldwide, especially in sandstone basins and metamorphic mountain belts.