sedimentary

Sandstone

Arenite (primarily SiO2)

Hardness: 6-7 (Mohs scale); Color: Tan, brownish-red, or pinkish; Luster: Dull/Earthy; Crystal structure: Clastic (grain-based); Cleavage: None; Specific gravity: 2.2 - 2.8

Hardness: 6-7 (Mohs scale)
Color: Tan, brownish-red, or pinkish
Luster: Dull/Earthy

Identified March 11, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Tan, brownish-red, or pinkish; Luster: Dull/Earthy; Crystal structure: Clastic (grain-based); Cleavage: None; Specific gravity: 2.2 - 2.8

Formation & geological history

Formed through the accumulation and litification of sand-sized mineral grains or rock fragments (0.0625 to 2 mm). Most commonly found in ancient river deltas, desert dunes, and beaches.

Uses & applications

Widely used as a construction material (building stone, paving), in glass manufacturing (if high silica content), and for grindstones.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. It is highly porous and frequently acts as an aquifer for groundwater or a reservoir for oil and natural gas.

Field identification & locations

Identify in the field by its gritty, sandpaper-like texture. It is ubiquitous globally particularly in the Colorado Plateau, USA, and Northern England. Collectors look for unique banding (wonderstone) or fossil inclusions.