sedimentary

Sandstone

Arenite (SiO2 principal component)

Hardness: 6-7 (Mohs scale), Color: tan, yellow, or earthy brown (due to iron oxides), Luster: dull to earthy, Crystal structure: granular clastic texture, Cleavage: none, Specific Gravity: 2.2-2.8

Identified June 23, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale), Color: tan, yellow, or earthy brown (due to iron oxides), Luster: dull to earthy, Crystal structure: granular clastic texture, Cleavage: none, Specific Gravity: 2.2-2.8

Formation & geological history

Formed from the accumulation and cementation of sand-sized mineral particles or rock fragments, typically quartz or feldspar. These deposits often occur in desert, river, or coastal environments over millions of years. This specimen shows water-worn rounding.

Uses & applications

Widely used for construction and architectural stone, paving material, and as a reservoir rock in the petroleum industry. Generally collected for educational purposes or landscaping.

Geological facts

Sandstone can vary greatly in composition but quartz is the most common mineral. It often preserves fossils and ripple marks from ancient environments. It makes up roughly 20-25% of all sedimentary rocks on Earth.

Field identification & locations

Identify by its gritty, sandpaper-like feel and visible grains. It is commonly found in sedimentary basins and along antiguas riverbeds or coastlines. Look for layers or bedding planes in larger outcrops.