sedimentary

Sandstone Pebble

Arenite (SiO2 with minor mineral cements)

AI-generated identification · may be incorrect

Hardness: 6-7 (if quartz-based); Color: tan, grey, cream; Luster: dull; Crystal structure: granular clastic texture; Specific gravity: 2.3-2.6.

Hardness: 6-7 (if quartz-based)
Color: tan, grey, cream
Luster: dull

Identified July 8, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (if quartz-based); Color: tan, grey, cream; Luster: dull; Crystal structure: granular clastic texture; Specific gravity: 2.3-2.6.

Formation & geological history

Formed from the accumulation and lithification of sand-sized mineral grains or rock fragments, typically in riverbeds, beaches, or desert environments. This specimen shows significant rounding from water erosion (fluvial or marine).

Uses & applications

Used in construction, landscaping, as an abrasive, and for making glass if the silica content is high. In this form, it is primarily a decorative or geological collecting item.

Geological facts

Sandstone can preserve fossilized footprints and ripple marks from ancient environments. It is one of the most common types of sedimentary rock on Earth.

Field identification & locations

Identify by its gritty, sandpaper-like feel and visible grains. Primarily found in old riverbeds or along coastlines. It will not fizz with acid unless it contains calcite cement.