sedimentary

Sandstone Pebble

Arenite (primarily SiO2)

Hardness: 6-7 on Mohs scale; Color: Tan, beige, or yellowish-brown; Luster: Dull/Earthy; Crystal Structure: Clastic (sand-sized grains); Cleavage: None (conchoidal fracture on grains); Specific Gravity: 2.2-2.8

Hardness: 6-7 on Mohs scale
Color: Tan, beige, or yellowish-brown
Luster: Dull/Earthy

Identified April 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation and cementation of mineral particles or rock fragments (sand) in environments like riverbeds, deserts, or beaches. This specimen appears water-worn and rounded by fluvial or coastal transport.

Uses & applications

Used primarily as construction aggregate, road base, and decorative landscaping gravel. In larger forms, sandstone is a major dimension stone for architecture.

Geological facts

Sandstone comprises about 20-25% of all sedimentary rocks on Earth. It often acts as a massive reservoir for groundwater, oil, and natural gas due to its high porosity.

Field identification & locations

Identify in the field by its gritty, sandpaper-like feel and the visible presence of small, cemented sand grains. Common in riverbeds and ancient sedimentary basins worldwide.