sedimentary

Sandstone

Arenite

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

Hardness: 6-7 (Mohs scale)
Color: Tan, beige, or yellow-brown
Luster: Dull/Earthy

Identified February 15, 2026More sedimentary →

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Physical properties

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

Formation & geological history

Formed through the accumulation, compaction, and cementation of sand-sized mineral grains or rock fragments. These specimens are often shaped into rounded 'cobbles' by water erosion in riverbeds or coastal environments over millions of years.

Uses & applications

Commonly used as a building material, for paving, in the manufacture of glass (if high silica content), and for grindstones or architectural stone carving.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. Its porosity makes it a critical reservoir for groundwater and petroleum.

Field identification & locations

Identify in the field by its gritty, sandpaper-like texture and visible small grains. Found globally in basins, deserts, and riverbeds. Look for layering (stratification) which is often visible on larger pieces.