sedimentary

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily SiO2 with FeO(OH) impurities)

AI-generated identification · may be incorrect

Hardness: 6-7 (approximate); Color: Tan, brown, ochre; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2–2.8

Hardness: 6-7 (approximate)
Color: Tan, brown, ochre
Luster: Dull/Earthy

Identified April 12, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (approximate); Color: Tan, brown, ochre; Luster: Dull/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. The brown color indicates the presence of iron oxides (like goethite or limonite) that oxidized during or after the rock's formation.

Uses & applications

Used primarily in construction as a building stone or paving material. Crushed sandstone is used in road base and as a source of silica for glass manufacturing.

Geological facts

Sandstone makes up about 20-25% of all sedimentary rocks on Earth. It is a major reservoir for water (aquifers) and oil/gas because of its high porosity.

Field identification & locations

Identify in the field by its 'sandpaper' texture. It often occurs in bedded layers. Look for granular surfaces that feel gritty to the touch and can be scratched with a steel blade to see if individual grains dislodge.