sedimentary

Sandstone Pebble

Arenite (majoritarily SiO2)

Hardness: 6-7 Mohs; Color: Tan, brown, or buff; Luster: Dull/Earthy; Crystal Structure: Clastic texture with visible sand grains; Cleavage: None; Specific Gravity: 2.2-2.8.

Hardness: 6-7 Mohs
Color: Tan, brown, or buff
Luster: Dull/Earthy

Identified July 10, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Tan, brown, or buff; Luster: Dull/Earthy; Crystal Structure: Clastic texture with visible sand grains; Cleavage: None; Specific Gravity: 2.2-2.8.

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in riverbeds, deserts, or coastal environments. This specimen appears water-worn into a rounded pebble shape.

Uses & applications

Used in construction, for making whetstones, as a decorative garden stone, or as a source of silica for glassmaking. Small pebbles are often used in landscaping.

Geological facts

Sandstone represents about 20-25% of all sedimentary rocks on Earth. The layers within sandstone can provide information about the ancient wind or water current directions when it was deposited.

Field identification & locations

Identify by the gritty feel (like sandpaper) and visible grains. Often found in riverbeds, beaches, and eroded cliff faces. Test by scratching glass (if quartz-rich) or checking for layering.