sedimentary

Sandstone

Arenite (primary component SiO2)

Hardness: 6-7 (Mohs scale); Color: Brown, grey, tan with white patches; Luster: Dull/Earthy; Crystal structure: Granular (clastic texture); Cleavage: None (conchoidal to irregular fracture); Specific Gravity: 2.2-2.8

Hardness: 6-7 (Mohs scale)
Color: Brown, grey, tan with white patches
Luster: Dull/Earthy

Identified May 28, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral particles or rock fragments, typically within river, ocean, or desert environments. This specimen appears to have undergone secondary mineral precipitation (like calcite or quartz) on its surface.

Uses & applications

Extensively used as a building material, road base, abrasive material, and as a reservoir rock for oil and gas.

Geological facts

Sandstone can withstand weathering for centuries and is the most common rock type found in the famous canyons of the American Southwest. It archives earth's history through preserved ripples and fossils.

Field identification & locations

Identify in the field by its gritty, sandpaper-like feel and visible grains. It is extremely common worldwide in sedimentary basin formations. Collectors look for unique banding (wonderstone) or fossil inclusions.