sedimentary

Sandstone Pebble

Arenite (SiO2 based)

Hardness: 6-7 Mohs; Color: Tan to light grey; Luster: Dull/Earthy; Crystal Structure: Clastic (composed of grains); Specific Gravity: 2.2-2.8; Texture: Gritty like sandpaper.

Hardness: 6-7 Mohs
Color: Tan to light grey
Luster: Dull/Earthy

Identified July 15, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Tan to light grey; Luster: Dull/Earthy; Crystal Structure: Clastic (composed of grains); Specific Gravity: 2.2-2.8; Texture: Gritty like sandpaper.

Formation & geological history

Formed via the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years. This specimen shows significant river or beach erosion (rounding).

Uses & applications

Used in construction, glass manufacturing, and as decorative landscaping stones. Highly rounded pebbles are often found in home decor.

Geological facts

Sandstone can be found in almost every geological period. The grain size and rounding indicate the distance the sediment traveled from its source.

Field identification & locations

Identified by its gritty texture and visible sand grains. Commonly found in riverbeds, beaches, and dry washes. Often reacts with acid if it has a calcitic cement.