sedimentary

Sandstone

Arenite (SiO2 based)

Hardness: 6-7 on Mohs scale; Color: Yellowish-brown to tan with dark inclusions; Luster: Dull/Earthy; Crystal structure: Clastic (sand-sized grains); Cleavage: None; Specific gravity: 2.0-2.6

Hardness: 6-7 on Mohs scale
Color: Yellowish-brown to tan with dark inclusions
Luster: Dull/Earthy

Identified June 28, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Yellowish-brown to tan with dark inclusions; Luster: Dull/Earthy; Crystal structure: Clastic (sand-sized grains); Cleavage: None; Specific gravity: 2.0-2.6

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral particles or rock fragments over millions of years, often in river beds, beaches, or desert environments. This specimen appears water-worn, indicating transport by a river or coastline.

Uses & applications

Commonly used as a building material, in glass manufacturing, and as decorative garden stones. High-quality varieties are used in sculpture and flooring.

Geological facts

Sandstone accounts for roughly 20% of all sedimentary rocks on Earth. This specific piece shows significant iron-oxide staining, which gives it its orange-brown hue.

Field identification & locations

Identify by its gritty, sandpaper-like feel and visible grains. It is extremely common worldwide in sedimentary basins. Collectors often look for examples with unique banding (Liesegang rings) or fossils.