sedimentary

Sandstone (Greywacke/Lithic Sandstone)

Arenite (composed primarily of SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale); Color: Brownish-grey; Luster: Dull/Earthy; Crystal structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.3-2.6

Hardness: 6-7 (Mohs scale)
Color: Brownish-grey
Luster: Dull/Earthy

Identified April 6, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Brownish-grey; Luster: Dull/Earthy; Crystal structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.3-2.6

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments (lithics). This specific specimen appears to be a water-worn river stone or 'cobble' that has been mechanically rounded by transport in water over hundreds to thousands of years.

Uses & applications

Used primarily in the construction industry as aggregate or road base. Fine-grained sandstones are historically used for dimension stone in buildings and pavers.

Geological facts

Sandstone makes up about 20-25% of all sedimentary rocks on Earth. The grains in this specimen are likely a mix of quartz and feldspar held together by a silica or calcium carbonate cement.

Field identification & locations

Identify by the 'sandpaper' feel of the surface and visible granular texture. Found globally in riverbeds, glacial deposits, and coastal areas. Highly common and pervasive in the terrestrial crust.