sedimentary

Sandstone (specifically Red Sandstone)

Arenite (primarily Quartz, SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale for grains); Color: Reddish-brown, tan, or ochre; Luster: Dull/Earthy; Structure: Clastic, granular texture similar to sandpaper; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (Mohs scale for grains)
Color: Reddish-brown, tan, or ochre
Luster: Dull/Earthy

Identified April 10, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale for grains); Color: Reddish-brown, tan, or ochre; Luster: Dull/Earthy; Structure: Clastic, granular texture similar to sandpaper; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments (clastic) in environments like deserts, river deltas, or beaches. Red coloration usually indicates iron oxide (hematite) cementation.

Uses & applications

Used extensively as a building material, in paving, for making grindstones, as a reservoir for oil and water, and in glass manufacturing if pure enough.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. The famous red rocks of Sedona, Arizona, and the structures of Petra, Jordan, are carved from sandstone.

Field identification & locations

Identify by its gritty texture that feels like sandpaper to the touch; look for visible layering or bedding planes. Common in arid regions and coastal areas worldwide.