sedimentary

Sandstone (Quartzose Pebble)

Arenite (SiO2)

Hardness: 6-7 on Mohs scale; Color: Greyish-brown with white weathering; Luster: Dull to earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: approx 2.6

Hardness: 6-7 on Mohs scale
Color: Greyish-brown with white weathering
Luster: Dull to earthy

Identified June 25, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Greyish-brown with white weathering; Luster: Dull to earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: approx 2.6

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. This specimen appears water-worn, suggesting a river or coastal origin where transport has smoothed its edges.

Uses & applications

Common sandstone is used in construction of buildings, road bases, and as a decorative stone. Small pebbles like this are often used in landscaping or aquarium gravel.

Geological facts

Sandstone makes up about 10-20% of Earth's sedimentary rocks. Detailed examination can reveal the environmental conditions of its formation millions of years ago, such as wind or water flow direction.

Field identification & locations

Identify in the field by its sandpaper-like feel and visible grains. It is extremely common globally in sedimentary basins. Collectors often look for unique shapes created by fluvial erosion.