sedimentary

Sandstone Pebble

Arenite (SiO2 primarily)

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

Hardness: 6-7 (Mohs scale)
Color: Tan, brown, or buff
Luster: Dull/Earthy

Identified July 6, 2026More sedimentary →

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Physical properties

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

Formation & geological history

Formed by the accumulation and cementation of sand-sized mineral grains, typically quartz or feldspar, over millions of years in riverbeds, deserts, or beaches (Phanerozoic Eon).

Uses & applications

Used extensively in construction as building stone, road base, or aggregate; fine-grained varieties are used for sharpening tools or as decorative landscaping stones.

Geological facts

Sandstone can hold significant amounts of water or oil in its pore spaces, making it a vital reservoir rock for groundwater aquifers and petroleum resources.

Field identification & locations

Identify by its gritty, sandpaper-like feel and visible clastic grains. Commonly found in riverbeds, canyons, and sedimentary basins worldwide. Look for layered structures and rounded edges if water-worn.