sedimentary

Sandstone (with Iron Staining)

Arenite

Hardness: 6-7 (Mohs); Color: Tan, white, and yellowish-orange; Luster: Dull or earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.2-2.8

Hardness: 6-7 (Mohs)
Color: Tan, white, and yellowish-orange
Luster: Dull or earthy

Identified July 1, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Tan, white, and yellowish-orange; Luster: Dull or earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.2-2.8

Formation & geological history

Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments, often in riverbeds, deserts, or coastal environments over millions of years.

Uses & applications

Commonly used as a base material in construction, road building, and as an architectural stone. Sometimes used for making glass if high in quartz.

Geological facts

Sandstone makes up about 10-20% of Earth's sedimentary rocks. The yellowish coloring is typically due to the oxidation of iron minerals like hematite or goethite.

Field identification & locations

Look for a gritty texture like sandpaper. It is found globally in sedimentary basins. Collectors often look for colorful banding or fossil inclusions within the layers.