sedimentary

Sandstone

Arenite (primarily SiO2)

Hardness: 6-7 (Mohs scale); Color: Tan, yellow, red, or brown; Luster: Dull/Earthy; Crystal structure: Clastic (granular); Cleavage: None; Specific gravity: 2.2-2.8

Hardness: 6-7 (Mohs scale)
Color: Tan, yellow, red, or brown
Luster: Dull/Earthy

Identified March 21, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Tan, yellow, red, or brown; Luster: Dull/Earthy; Crystal structure: Clastic (granular); Cleavage: None; Specific gravity: 2.2-2.8

Formation & geological history

Formed by the accumulation and cementation of mineral particles or rock fragments (sand) over millions of years. This specimen likely dates back to the Mesozoic or Paleozoic eras, formed in high-energy environments like deserts or riverbeds.

Uses & applications

Extensively used as a building material, paving stone, and in the production of glass (if high silica content). Also popular for garden landscaping and decorative carving.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. The famous Red Rocks Amphitheatre in Colorado is a natural sandstone formation.

Field identification & locations

Identify in the field by its gritty, sand-paper-like texture. Commonly found in sedimentary basins, canyon walls, and coastal cliffs. Look for visible bedding layers.