sedimentary

Sandstone (Quartzite Pebble)

Arenite / Metamorphosed Sandstone (SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale; Color: Grey to brownish-grey; Luster: Dull to earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.6-2.7

Hardness: 6-7 on Mohs scale
Color: Grey to brownish-grey
Luster: Dull to earthy

Identified May 4, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Grey to brownish-grey; Luster: Dull to earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.6-2.7

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. This specific specimen appears to be a river-worn pebble, likely originating from many millions of years of erosion and transport.

Uses & applications

Common sandstone is used in construction and road base. As a small river pebble, its primary value is as a decorative landscaping element or a common geological sample.

Geological facts

Sandstone records historical environmental changes; the cross-bedding often found in larger formations can tell geologists the direction of ancient winds or water currents.

Field identification & locations

Can be identified by its gritty, sandpaper-like texture and its ability to scratch glass if it is quartz-rich. Found globally in riverbeds, beaches, and desert outcrops.