sedimentary

Sandstone

Arenite (SiO2 based)

Hardness: 6-7 on Mohs scale; Color: olive drab to brownish-tan; Luster: dull/earthy; Texture: granular, sandpaper-like; Cleavage: none.

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

Identified May 3, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: olive drab to brownish-tan; Luster: dull/earthy; Texture: granular, sandpaper-like; Cleavage: none.

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in riverbeds, lakes, or oceans over millions of years.

Uses & applications

Primarily used as a building material, in the manufacturing of glass, and as a common specimen for educational geological collections.

Geological facts

Sandstone accounts for about 10-25% of the sedimentary rocks on Earth. The grains are typically composed of quartz or feldspar because these are the most resistant minerals to weathering.

Field identification & locations

Identify in the field by its gritty texture and visible sand grains. This specific specimen has been chemically or physically weathered into a unique elongated 'cigar' shape.