sedimentary

Sandstone (Ferruginous)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale); Color: Brown, tan, reddish (indicates iron content); Luster: Dull/Earthy; Crystal Structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (Mohs scale)
Color: Brown, tan, reddish (indicates iron content)
Luster: Dull/Earthy

Identified April 19, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Brown, tan, reddish (indicates iron content); Luster: Dull/Earthy; Crystal Structure: Clastic/Granular; 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. These grains are typically quartz or feldspar. The brown/orange tint suggests it formed in an environment with high oxygen and iron-rich minerals (limonite/hematite staining).

Uses & applications

Used widely in construction as a building material, for paving, and in the manufacturing of glass. In landscaping, it is used for decorative stones and retaining walls.

Geological facts

Sandstone makes up about 20-25% of all sedimentary rocks on Earth. The iconic 'Red Rocks' in the American Southwest and the ancient city of Petra are both famous examples of sandstone formations.

Field identification & locations

Identify in the field by its gritty, sandpaper-like texture and visible grains. It is commonly found in river beds, deserts, and coastal areas. For collectors, look for unique shapes or interesting banding (Liesegang rings).