sedimentary

Sandstone

Arenite (Sedimentary rock composed of sand-sized grains)

AI-generated identification · may be incorrect

Hardness: 6-7 (based on quartz content); Color: Tan, brown, yellow, red, or grey; Luster: Dull/Earthy; Crystal Structure: Clastic (composed of mineral particles); Cleavage: None; Specific Gravity: 2.2–2.8

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

Identified May 24, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation and cementation of sand-sized grains. Most commonly forms in riverbeds, deserts, or coastal environments over millions of years.

Uses & applications

Commonly used in construction for paving, building facades, and wall masonry. Historically used for making grindstones and sculptures.

Geological facts

Sandstone makes up approximately 20 to 25 percent of all sedimentary rocks on Earth. The famous Red Rocks Amphitheatre in Colorado is carved into local sandstone deposits.

Field identification & locations

Identify in the field by its gritty texture (feels like sandpaper) and visible layering (bedding). Commonly found in dry, mountainous, or canyon regions. Collectors look for unique color bands or fossil inclusions.