sedimentary

Sandstone (Stream Pebble)

Arenite (primarily SiO2)

AI-generated identification · may be incorrect

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

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

Identified April 7, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Tan, beige, or light brown; Luster: Dull/Earthy; Crystal Structure: Clastic (grainy); 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). This specific specimen has been rounded and smoothed by fluvial (river) or glacial transport over thousands of years.

Uses & applications

Commonly used as construction aggregate, decorative landscaping stone, or as a source of silica for glass manufacturing.

Geological facts

Sandstone can be composed of almost any mineral, but quartz is the most common because it is the most resistant to chemical weathering. This smooth, elliptical shape is known as a 'clast' in geology.

Field identification & locations

Identify in the field by its gritty texture (feels like sandpaper) and rounded edges indicating water transport. Commonly found in riverbeds, beaches, and ancient sedimentary basins.