sedimentary

Sandstone (Pebble)

Sandstone

Hardness: 6-7 on Mohs scale; Color: Tan, beige, brown; Luster: Dull, earthy; Grain structure: Granular clastic sedimentary texture consisting mostly of quartz grains; Cleavage: None

Hardness: 6-7 on Mohs scale
Color: Tan, beige, brown
Luster: Dull, earthy

Identified July 22, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Tan, beige, brown; Luster: Dull, earthy; Grain structure: Granular clastic sedimentary texture consisting mostly of quartz grains; Cleavage: None

Formation & geological history

Formed by the compaction and cementation of sand-sized mineral particles or rock fragments, typically deposited in river beds, beaches, or deserts over millions of years.

Uses & applications

Commonly used in construction, paving, landscaping, and as aggregate material. Uncut small pebbles are primarily decorative or field samples.

Geological facts

Sandstone consists predominantly of quartz and feldspar, which are among the most common minerals in the Earth's crust. It frequently preserves sedimentary structures like cross-bedding and ripple marks.