sedimentary

Sandstone (Pebble)

Arenite (primarily SiO2)

Hardness: 6-7 Mohs; Color: Tan, beige, or light brown; Luster: Dull/Earthy; Crystal structure: Clastic (grains of sand); Cleavage: None; Specific gravity: 2.2-2.8

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

Identified March 8, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Tan, beige, or light brown; Luster: Dull/Earthy; Crystal structure: Clastic (grains of sand); Cleavage: None; Specific gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of mineral particles or rock fragments (clastic formation). This specific specimen shows 'well-rounded' sorting, indicating it was transported by water over a long period. Geological age can range from Precambrian to Holocene.

Uses & applications

Commonly used as a building material, in the manufacture of glass (if high silica content), and as a reservoir rock for oil and gas. Small rounded pebbles are used in landscaping and aquariums.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. The famous red rocks of the Grand Canyon and the ancient city of Petra are both primarily sandstone formations.

Field identification & locations

Identify by its gritty texture (feels like sandpaper) and visible sand-sized grains. It is extremely common in riverbeds, beaches, and desert environments worldwide. Collectors look for unique banding or fossils within the layers.