sedimentary

Sandstone Pebble

Quartz Sandstone

Hardness: 6-7 on Mohs scale; Color: Tan to brownish-gray; Luster: Dull to earthy; Texture: Granular, sand-like feel; Structure: Clastic sedimentary

Hardness: 6-7 on Mohs scale
Color: Tan to brownish-gray
Luster: Dull to earthy

Identified July 26, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Tan to brownish-gray; Luster: Dull to earthy; Texture: Granular, sand-like feel; Structure: Clastic sedimentary

Formation & geological history

Formed through the cementation and compaction of sand-sized mineral particles or rock fragments, typically composed of quartz and feldspar, smoothed by natural river or beach erosion.

Uses & applications

Commonly used in construction, landscaping, road base, or aggregate. Highly polished or uniquely shaped pebbles are collected for crafts or decorative purposes.

Geological facts

Sandstone represents about 10-20% of all sedimentary rocks on Earth. The rounded shape indicates extensive weathering and transport by water or ice over long periods.

Field identification & locations

Identified by its distinctly sandy, abrasive texture felt when rubbed. Found abundantly in riverbeds, lakeshores, beaches, and sedimentary rock formations worldwide.