sedimentary

Sandstone

Arenite

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs), Color: Tan to light cream/grey-green, Luster: Dull or earthy, Crystal structure: Clastic (composed of cemented sand-sized grains), Cleavage: None (fractures across grains), Specific Gravity: 2.2-2.8

Identified May 17, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed by the accumulation and lithification of sand-sized grains (mostly quartz and feldspar). These grains are deposited in environments such as deserts, river deltas, or beaches and then cemented together by minerals like silica or calcium carbonate over millions of years.

Uses & applications

Primarily used as a building material and paving stone. In industry, high-purity sandstone is crushed to extract silica for glass making. Small specimens are often used as educational tools or natural décor.

Geological facts

Sandstone is one of the most common sedimentary rocks on Earth. Because it is porous, it often acts as a natural aquifer, storing large quantities of groundwater or petroleum.

Field identification & locations

Identify in the field by its gritty, sandpaper-like texture and visible sand grains. Found globally in canyon walls and outcrops. Collectors often look for examples with unique weathering shapes or cross-bedding layers.