sedimentary

Sandstone

Arenite (SiO2 based)

Hardness: 6-7 Mohs; Color: Tan, yellow, or earthy brown; Luster: Dull/Earthy; Crystal Structure: Clastic (sand-sized grains); Cleavage: None/Grainy fracture; Specific Gravity: 2.2-2.8

Hardness: 6-7 Mohs
Color: Tan, yellow, or earthy brown
Luster: Dull/Earthy

Identified June 14, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Tan, yellow, or earthy brown; Luster: Dull/Earthy; Crystal Structure: Clastic (sand-sized grains); Cleavage: None/Grainy fracture; Specific Gravity: 2.2-2.8

Formation & geological history

Formed by the accumulation and lithification of sand-sized mineral particles (usually quartz or feldspar) in environments like deserts, riverbeds, or beaches. Geological age ranges from Precambrian to Holocene.

Uses & applications

Extensively used in construction for building stone, decorative pavers, and as a source of silica for glass manufacturing.

Geological facts

Sandstone can store significant amounts of water or oil in its pore spaces, making it a critical reservoir rock for the petroleum and groundwater industries.

Field identification & locations

Identify by its gritty, sandpaper-like feel and visible grains. It can be found globally in sedimentary basins. Collectors often look for colorful banding or fossil inclusions.