sedimentary

Sandstone

Arenite (SiO2 with various cementation agents)

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale; Color: Tan, brown, or buff; Luster: Dull or earthy; Crystal structure: Clastic (composed of sand-sized mineral grains); Cleavage: None; Specific Gravity: 2.2 to 2.8.

Hardness: 6-7 on Mohs scale
Color: Tan, brown, or buff
Luster: Dull or earthy

Identified June 29, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Tan, brown, or buff; Luster: Dull or earthy; Crystal structure: Clastic (composed of sand-sized mineral grains); Cleavage: None; Specific Gravity: 2.2 to 2.8.

Formation & geological history

Sandstone forms through the accumulation of sand-sized grains, typically quartz or feldspar, which are cemented together by minerals like silica, calcium carbonate, or iron oxide. This process, called lithification, occurs over millions of years in environments like beaches, deserts, and river deltas.

Uses & applications

Extensively used as a construction material for buildings and paving due to its durability. In industry, it is a source of silica for glass manufacturing. It is also used as a decorative stone in landscaping.

Geological facts

Sandstone can preserve fossilized footprints and ripple marks from ancient environments. It often acts as a significant aquifer, storing large quantities of groundwater or oil due to its porosity.

Field identification & locations

Identify in the field by its gritty, sandpaper-like texture and visible layers (bedding planes). It is commonly found in sedimentary basins and arid regions globally. Collectors look for unique banding or fossil inclusions.