sedimentary

Sandstone (lithic/quartz variant)

Clastic sedimentary rock (SiO2 predominant)

AI-generated identification · may be incorrect

Hardness: 6-7 (individual grains); Color: tan, buff, light brown; Luster: dull/earthy; Crystal Structure: Amorphous (granular); Cleavage: none; Specific Gravity: 2.2-2.8

Hardness: 6-7 (individual grains)
Color: tan, buff, light brown
Luster: dull/earthy

Identified July 16, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (individual grains); Color: tan, buff, light brown; Luster: dull/earthy; Crystal Structure: Amorphous (granular); Cleavage: none; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral particles or rock fragments over millions of years, typically in desert or marine environments.

Uses & applications

Used primarily in building construction as cladding, paving material, and as a source for industrial sand.

Geological facts

Sandstone comprises about 20-25% of all sedimentary rocks on Earth. The famous Red Rocks of Colorado and the Petra ruins in Jordan are carved from sandstone.

Field identification & locations

Identify by its gritty, sandpaper-like texture and visible grains. Common in riverbeds, canyons, and coastal cliffs. Collectors look for unique banding or fossil inclusions.