sedimentary

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz with Limonite/Goethite staining)

AI-generated identification · may be incorrect

Hardness: 6-7 (Quartz grains) but aggregate may crumble; Color: Tan, brown, ochre; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; SG: 2.2-2.8

Hardness: 6-7 (Quartz grains) but aggregate may crumble
Color: Tan, brown, ochre
Luster: Dull/Earthy

Identified April 12, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Quartz grains) but aggregate may crumble; Color: Tan, brown, ochre; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; SG: 2.2-2.8

Formation & geological history

Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years, often in desert, river, or ocean environments. This specimen shows significant iron oxide staining from groundwater interaction.

Uses & applications

Commonly used as a building material, in paving, as a source for glass sand, and in grindstones.

Geological facts

Sandstone makes up about 20-25% of all sedimentary rocks on Earth. The famous 'Wave' formation in Arizona is a prime example of wind-sculpted sandstone.

Field identification & locations

Identify by its gritty, sandpaper-like texture and visible grain structure. Look for bedding planes or layers. It is found globally in sedimentary basins.