sedimentary

Sandstone (Quartzose)

Arenite (primarily SiO2)

Hardness: 6-7 (Mohs); Color: Tan, beige, or light brown; Luster: Dull/Earthy; Crystal Structure: Clastic grain texture (granular); Cleavage: None (fractures around grains).

Hardness: 6-7 (Mohs)
Color: Tan, beige, or light brown
Luster: Dull/Earthy

Identified July 12, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Tan, beige, or light brown; Luster: Dull/Earthy; Crystal Structure: Clastic grain texture (granular); Cleavage: None (fractures around grains).

Formation & geological history

Formed through the accumulation and cementation of mineral particles or rock fragments (clasts) usually in riverbeds, deserts, or marine environments over millions of years.

Uses & applications

Commonly used as a building material, paving stone, and for manufacturing glass (if high purity quartz). It is also a significant reservoir rock for oil, gas, and groundwater.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. The famous Red Rocks of Colorado and the structures of Petra in Jordan are both made of sandstone.

Field identification & locations

Identify by its gritty, sandpaper-like feel and visible grains. Often found in layered outcrops. For collectors, look for unique weathering patterns or fossil inclusions.