sedimentary

Sandstone (specifically Cross-bedded Sandstone)

Arenite (composed primarily of SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale); Color: Tan, gray, and brown banding; Luster: Dull/Earthy; Crystal Structure: Granular/Clastic; Cleavage: None (breaks across grains); Specific Gravity: 2.2-2.8

Hardness: 6-7 (Mohs scale)
Color: Tan, gray, and brown banding
Luster: Dull/Earthy

Identified March 26, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Tan, gray, and brown banding; Luster: Dull/Earthy; Crystal Structure: Granular/Clastic; Cleavage: None (breaks across grains); Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and lithification of sand-sized mineral particles or rock fragments. The distinct angled layers (cross-bedding) indicate formation in a high-energy environment such as a desert dune field or a river channel where water or wind currents shifted direction over time.

Uses & applications

Used extensively as a building material and decorative stone in construction; crushed for use in concrete and asphalt; and as a reservoir rock for oil, gas, and groundwater in the energy industry.

Geological facts

Cross-bedding provides geologists with a 'paleocurrent direction,' allowing them to map the direction winds or rivers were flowing millions of years ago. Some of the most famous sandstone formations are in the American Southwest, such as the Navajo Sandstone of Zion National Park.

Field identification & locations

Identify in the field by its gritty, sandpaper-like texture and visible layered structures. It can be found globally in sedimentary basins. Collectors look for unique banding patterns like 'Wonderstone' or distinct trace fossils.