sedimentary

Sandstone

Sandstone (composed mainly of Quartz, SiO2, and Feldspar)

Hardness: 6-7 on Mohs scale (for quartz grains); Color: Buff, tan, light brown, to beige; Luster: Dull to earthy; Texture: Medium-grained, gritty to the touch with visible bedding planes; Specific Gravity: 2.2-2.8

Hardness: 6-7 on Mohs scale (for quartz grains)
Color: Buff, tan, light brown, to beige
Luster: Dull to earthy

Identified July 24, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation, compaction, and cementation of mineral particles or rock fragments (usually quartz and feldspar) in shallow marine, river, desert, or delta environments over millions of years.

Uses & applications

Widely used as a construction material, paving stone, dimension stone for buildings, flagstone for landscaping, and historically for grindstones and sculpture.

Geological facts

Sandstone accounts for roughly 20-25% of all sedimentary rocks on Earth. Its porous nature makes it a crucial reservoir rock for groundwater, petroleum, and natural gas deposits.

Field identification & locations

Identified by its gritty feel similar to sandpaper and visible parallel bedding lines (bedding planes). Commonly found worldwide in riverbeds, canyons, cliffs, and quarries. Highly prized as decorative flagstone in landscaping.

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