sedimentary

Sandstone (Pebble)

Arenite (SiO2 based)

AI-generated identification · may be incorrect

Hardness: 6-7 Mohs; Color: Tan, brown, or buff; Luster: Dull/Earthy; Crystal Structure: Clastic (sand-sized grains); Cleavage: None; Specific Gravity: 2.2-2.8

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

Identified May 27, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Tan, brown, or buff; Luster: Dull/Earthy; Crystal Structure: Clastic (sand-sized grains); Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of mineral particles or rock fragments (clasts) usually composed of quartz or feldspar. This occurs in desert, river, or coastal environments over millions of years.

Uses & applications

Used primarily as a building material, in the manufacture of glass, for road base, and as a component in concrete and mortar. Smaller pebbles are often used in landscaping.

Geological facts

Sandstone makes up about 20-25% of all sedimentary rocks on Earth. It is a major aquifer and petroleum reservoir due to its high porosity and permeability.

Field identification & locations

Identify in the field by its gritty texture (feels like sandpaper) and visible sand grains. It often appears in stratified layers or beds in natural outcroppings.