sedimentary

Sandstone (Red)

Arenite (SiO2 with Fe2O3)

Hardness: 6-7 Mohs; Color: reddish-brown; Luster: dull/earthy; Crystal Structure: Clastic (usually quartz grains); Cleavage: none; Specific Gravity: 2.2-2.8.

Hardness: 6-7 Mohs
Color: reddish-brown
Luster: dull/earthy

Identified February 19, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: reddish-brown; Luster: dull/earthy; Crystal Structure: Clastic (usually quartz grains); Cleavage: none; Specific Gravity: 2.2-2.8.

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments (detritus). Red coloration is due to the presence of iron oxide (hematite) coating the grains during lithification.

Uses & applications

Widely used as building stone, paving material, and in glass manufacturing or abrasive industries. Highly popular for domestic landscaping.

Geological facts

Red sandstones are famous for forming dramatic landscapes in the American Southwest and the Old Red Sandstone deposits in Scotland which were critical to the development of early geology.

Field identification & locations

Identify by its gritty texture (feels like sandpaper) and visible sand grains. Found globally in desert environments, river basins, and coastal areas. Collectors look for unique weathering patterns or fossils.