sedimentary

Sandstone (Ferruginous)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale; Color: Tan to reddish-brown; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 on Mohs scale
Color: Tan to reddish-brown
Luster: Dull/Earthy

Identified April 12, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Tan to reddish-brown; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed from the accumulation and cementation of sand-sized silicate grains. The brownish-yellow hue suggests iron-oxide (limonite or hematite) cementation. These rocks can form in deserts, riverbeds, or coastal environments over millions of years.

Uses & applications

Used primarily in construction as a building stone or flagstone. When crushed, it is used in road bases and glass manufacturing if pure enough. Weathered specimens are common in landscaping.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. The famous red rocks of Sedona and the Grand Canyon are massive layers of ferruginous sandstone.

Field identification & locations

Identify by its gritty, sandpaper-like feel and visible grains. It is commonly found in sedimentary basins and along canyon walls. Collectors often look for specimens with unique weathering patterns or 'desert varnish' patinas.