sedimentary

Sandstone

Arenite

Hardness: 6-7 Mohs scale; Color: Tan, beige, or yellowish; Luster: Dull or earthy; Crystal structure: Clastic (composed of mineral grains); Cleavage: None; Specific gravity: 2.2-2.8

Hardness: 6-7 Mohs scale
Color: Tan, beige, or yellowish
Luster: Dull or earthy

Identified June 21, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs scale; Color: Tan, beige, or yellowish; Luster: Dull or earthy; Crystal structure: Clastic (composed of mineral grains); Cleavage: None; Specific gravity: 2.2-2.8

Formation & geological history

Formed from the lithification of sand-sized mineral grains or rock fragments, typically through compaction and cementation. Often associated with ancient beaches, deserts, or river beds. Ages vary from Precambrian to Holocene.

Uses & applications

Used widely in construction as a building material, paving, and decorative stone. Also used as a reservoir rock for oil and gas or a source of silica for glassmaking.

Geological facts

Sandstone is one of the most common types of sedimentary rock and often preserves ripple marks and cross-bedding from the original environment. It makes up about 20% of all sedimentary rocks on Earth.

Field identification & locations

Identify by its gritty texture (feels like sandpaper) and visible sand grains. Found globally in basins and mountainous regions. Collectors look for unique banding or fossil inclusions.