sedimentary

Sandstone (Pebble)

Arenite

Hardness: 6-7 Mohs; Color: Light gray to beige; Luster: Dull/Earthy; Texture: Granular, sand-like feel; Structure: Clastic; Composition: Primarily quartz and feldspar grains.

Hardness: 6-7 Mohs
Color: Light gray to beige
Luster: Dull/Earthy

Identified July 16, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Light gray to beige; Luster: Dull/Earthy; Texture: Granular, sand-like feel; Structure: Clastic; Composition: Primarily quartz and feldspar grains.

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years, often in marine, river, or desert environments. This specimen has been rounded by water erosion (wave action).

Uses & applications

Used in construction, as a building stone, in glassmaking (if high quartz purity), and as a common decorative beach pebble.

Geological facts

Sandstone makes up about 20 to 25 percent of all sedimentary rocks on Earth. The grit or 'sandiness' you feel is because it is literally made of ancient sand grains cemented together.

Field identification & locations

Identify by its gritty texture (like sandpaper) and visible grains. Common in coastal areas, riverbeds, and sedimentary basins worldwide. Collectors often look for unique water-worn shapes.