sedimentary

Sandstone

Arenite

Hardness: 6-7 on Mohs scale; Color: Tan, beige, or yellowish with dark mineral inclusions; Luster: Dull or earthy; Crystal Structure: Clastic (composed of sand-sized grains); Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 on Mohs scale
Color: Tan, beige, or yellowish with dark mineral inclusions
Luster: Dull or earthy

Identified June 12, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in deserts, riverbeds, or coastal areas. This piece appears water-worn, suggesting transport by a river or beach activity.

Uses & applications

Commonly used in construction as a building material, for paving stones, and as an abrasive in industrial glass production.

Geological facts

Sandstone accounts for roughly 20 to 25 percent of all sedimentary rocks on Earth. It can preserve fossils and sedimentary structures like ripple marks or cross-bedding.

Field identification & locations

Identify by its gritty texture (feels like sandpaper) and visible grains. Often found in riverbeds or coastal cliffs. This specimen shows dark spots which are likely manganese or iron oxide inclusions.