sedimentary

Sandstone (Pebble)

Arenite (primarily SiO2)

Hardness: 6-7 Mohs; Color: White to light tan; Luster: Dull/Earthy; Crystal Structure: Clastic (sand grains); Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 Mohs
Color: White to light tan
Luster: Dull/Earthy

Identified June 8, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: White to light tan; Luster: Dull/Earthy; Crystal Structure: Clastic (sand grains); Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. This specimen shows significant rounding via water erosion, likely from a river or beach environment.

Uses & applications

Used primarily as a construction material (dimension stone), in glass making if high purity silica, and as a natural abrasive or decorative landscaping stone.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. It often preserves ancient ripple marks or cross-bedding from prehistoric dunes and riverbeds.

Field identification & locations

Identify in the field by its 'sandpaper' texture and visible small grains. It is commonly found in desert basins, riverbeds, and coastal cliffs worldwide.