sedimentary

Sandstone (Stream-Rolled)

Clastic Sedimentary Rock (primarily SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs); Color: Tan, beige, light brown; Luster: Dull/Earthy; Crystal Structure: Granular/Clastic; Specific Gravity: 2.2-2.8. Features a smooth, oblong shape due to water erosion.

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

Identified July 12, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Tan, beige, light brown; Luster: Dull/Earthy; Crystal Structure: Granular/Clastic; Specific Gravity: 2.2-2.8. Features a smooth, oblong shape due to water erosion.

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains, primarily quartz. This specific specimen has been shaped and smoothed over thousands of years by fluvial (river) or coastal water movement.

Uses & applications

Commonly used in construction, landscaping, and as an abrasive. Smooth river stones are popular for decorative garden use and 'worry stones'.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. It is an excellent aquifer, often holding large quantities of groundwater or oil in its porous structure.

Field identification & locations

Identify by its gritty, sandpaper-like feel and visible grain structure. Commonly found in riverbeds, canyons, and coastal areas. Collectors look for unique shapes or fossils contained within.