sedimentary

Sandstone

Arenite (primarily Quartz Arenite)

Hardness: 6-7 (Mohs); Color: Tan, brown, reddish-orange; Luster: Dull/Earthy; Texture: Granular, sand-like feel; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (Mohs)
Color: Tan, brown, reddish-orange
Luster: Dull/Earthy

Identified July 4, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Tan, brown, reddish-orange; Luster: Dull/Earthy; Texture: Granular, sand-like feel; 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. These sediments are typically deposited in rivers, deserts, or coastal environments. This specimen shows a weathered, rounded appearance indicative of water transport.

Uses & applications

Widely used in construction for grindstones, paving, and architectural cladding. It is also an important reservoir rock for groundwater and petroleum.

Geological facts

Sandstone accounts for approximately 20 to 25 percent of all sedimentary rocks on Earth. Its color is often determined by the cementing material; iron oxides typically produce the reddish-brown hues seen here.

Field identification & locations

Identify in the field by its gritty texture (feels like sandpaper) and visible sand grains. These are commonly found in riverbeds, canyons, and coastal cliffs.