sedimentary

Sandstone Pebble

Arenite (SiO2 dominated)

Hardness: 6-7 on Mohs scale. Color: brownish-pink/tan. Luster: dull to earthy. Texture: fine-grained, gritty surface feel with small visible quartz grains. Specific gravity: approx. 2.2-2.8.

Hardness: 6-7 on Mohs scale
Color: brownish-pink/tan
Luster: dull to earthy

Identified July 26, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale. Color: brownish-pink/tan. Luster: dull to earthy. Texture: fine-grained, gritty surface feel with small visible quartz grains. Specific gravity: approx. 2.2-2.8.

Formation & geological history

Formed through the accumulation, compaction, and cementation of sand-sized mineral particles or rock fragments, typically in riverbeds, beaches, or desert environments. This specimen has been rounded by fluvial or beach wave action.

Uses & applications

Commonly used as construction aggregate, paving materials, dimension stone, or decorative landscaping pebbles. Fine-grained sandstones are also collected as stream-smoothed river rocks.

Geological facts

Sandstone accounts for roughly 20-25% of all sedimentary rocks on Earth. Its porosity and permeability make it an important reservoir rock for groundwater and petroleum.

Field identification & locations

Identified by its distinctive sandpaper-like rough feel when scraped, visible rounded quartz grains, and rounded river-worn pebble shape. Commonly found in riverbeds, beaches, and sedimentary rock outcrops globally.