sedimentary

Sandstone Pebble

Arenite (SiO2 primarily)

Hardness: 6-7 (Mohs scale), Color: Cream, tan, and light brown with iron oxide staining, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Cleavage: None

Identified July 20, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale), Color: Cream, tan, and light brown with iron oxide staining, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Cleavage: None

Formation & geological history

Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments, typically through water or wind deposition in ancient riverbeds, beaches, or deserts over millions of years.

Uses & applications

Large scale sandstone is used in construction and landscaping; small pebbles like this are used in aquarium gravel, decorative landscaping, or as abrasives.

Geological facts

Sandstone represents about 20% of all sedimentary rocks on Earth. Its porosity makes it a valuable reservoir for water, oil, and natural gas.

Field identification & locations

Identified by its sandy texture (gritty to the touch like sandpaper) and visible grains. Commonly found in riverbeds, coastal areas, and desert environments worldwide.