sedimentary

Sandstone (Quartzose)

Arenite (SiO2 based)

Hardness: 6.5-7 (individual grains); Color: Brownish-red to tan; Luster: Dull/Earthy; Crystal Structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6
Color: Brownish-red to tan
Luster: Dull/Earthy

Identified April 20, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (individual grains); Color: Brownish-red to tan; Luster: Dull/Earthy; Crystal Structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains, typically quartz. Water or wind deposits these grains in layers which are then compacted and lithified over millions of years.

Uses & applications

Used primarily as road base, construction material, decorative landscaping, and occasionally for grindstones or architectural stone.

Geological facts

Sandstone contains about 20-25% of the total sedimentary rock on earth. It is often porous enough to act as a significant aquifer for groundwater or a reservoir for petroleum and natural gas.

Field identification & locations

Identify by its 'sandpaper' texture and visible small grains. It is commonly found in riverbeds, beaches, and desert environments. It will not fizz with acid unless it has a calcium carbonate cement.