sedimentary

Sandstone (Stream-rounded Cobble)

Arenite (composed primarily of SiO2, Silica)

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale; Color: Tan, beige, or grey with subtle bedding; Luster: Dull/Earthy; Crystal Structure: Clastic (granular texture); Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 on Mohs scale
Color: Tan, beige, or grey with subtle bedding
Luster: Dull/Earthy

Identified March 16, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Tan, beige, or grey with subtle bedding; Luster: Dull/Earthy; Crystal Structure: Clastic (granular texture); Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of mineral particles or rock fragments (sand-sized grains). This specific specimen has been rounded and smoothed by water transport in a river or coastal environment, likely over thousands of years.

Uses & applications

Used widely in construction as an aggregate, decorative landscaping stone, and historically as a building material for facades.

Geological facts

Sandstone can be porous enough to serve as an aquifer or a reservoir for petroleum and natural gas. Some varieties contain fossils, preserving ancient life forms within their layers.

Field identification & locations

Identify in the field by its gritty 'sandpaper' feel and visible layers (bedding). This specimen is a 'clast' found in alluvial deposits or stream beds globally.