sedimentary

Sandstone

Arenite (primarily Quartz Arenite)

Hardness: 6-7 (based on quartz content); Color: Tan, reddish-brown, or grey; Luster: Dull/Earthy; Crystal structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (based on quartz content)
Color: Tan, reddish-brown, or grey
Luster: Dull/Earthy

Identified June 18, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (based on quartz content); Color: Tan, reddish-brown, or grey; Luster: Dull/Earthy; Crystal structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of mineral particles or rock fragments (clasts). This specimen likely formed in a high-energy environment like a riverbed or desert dune, subsequently rounded by water erosion.

Uses & applications

Widely used as a construction material, for architectural cladding, paving stones, and grindstones for sharpening tools.

Geological facts

Sandstone makes up about 10-25% of all sedimentary rocks on Earth. The famous red rock formations in Sedona, Arizona and the Grand Canyon are primarily composed of colored sandstone layers.

Field identification & locations

Identify by its gritty, sandpaper-like feel and visible grains. Often found in arid regions or along current/ancient riverbeds. Collectors look for unique banding or fossils within the layers.