sedimentary

Sandstone

Arenite (primarily SiO2)

Hardness: 6-7 (on Mohs scale); Color: Tan, brown, or buff; Luster: Dull to earthy; Crystal structure: Clastic (usually quartz grains); Cleavage: None; Specific gravity: 2.2 - 2.8

Hardness: 6-7 (on Mohs scale)
Color: Tan, brown, or buff
Luster: Dull to earthy

Identified March 16, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (on Mohs scale); Color: Tan, brown, or buff; Luster: Dull to earthy; Crystal structure: Clastic (usually quartz grains); Cleavage: None; Specific gravity: 2.2 - 2.8

Formation & geological history

Formed through the accumulation of sand-sized mineral particles or rock fragments held together by a mineral cement (like silica or calcium carbonate) over millions of years. This specimen likely originates from a terrestrial or shallow marine environment.

Uses & applications

Extensively used as a building material, masonry, and road construction aggregate; also used for making grindstones and in glass manufacturing.

Geological facts

Sandstone accounts for roughly 20 to 25 percent of all sedimentary rocks. It is a major reservoir for groundwater and petroleum because of its porosity and permeability.

Field identification & locations

Identify in the field by its gritty 'sandpaper' feel when rubbed and the presence of visible grains. Common in arid desert regions and coastal formations worldwide.