sedimentary

Sandstone (likely Greywacke variant)

Arenite

Hardness: 6-7 (Mohs scale); Color: Dull grey to brownish-green; Luster: Dull/Earthy; Crystal Structure: Clastic (grains); Cleavage: None; Specific Gravity: 2.2-2.8. Texture is gritty like sandpaper.

Hardness: 6-7 (Mohs scale)
Color: Dull grey to brownish-green
Luster: Dull/Earthy

Identified April 2, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Dull grey to brownish-green; Luster: Dull/Earthy; Crystal Structure: Clastic (grains); Cleavage: None; Specific Gravity: 2.2-2.8. Texture is gritty like sandpaper.

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. Frequently forms in marine or river delta environments where sediment is rapidly buried.

Uses & applications

Used primarily in construction as a building stone, road base, or aggregate. Historically used for grindstones and architectural facades.

Geological facts

Sandstone contains about 20% to 25% of all sedimentary rocks in the Earth's crust. It can often act as a critical reservoir for groundwater and petroleum due to its porosity.

Field identification & locations

Identify by its gritty texture (feels like sandpaper) and visible sand grains. Common in sedimentary basins worldwide. When rubbed, small grains of sand may detach.