sedimentary

Sandstone (Calcareous or Ferruginous)

Clastic sedimentary rock (SiO2 with CaCO3 or Fe2O3 cement)

AI-generated identification · may be incorrect

Hardness: 6-7 (grains), 3-4 (cement); Color: Cream, tan, and grey with possible mineral staining; Luster: Dull/Earthy; Crystal Structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (grains), 3-4 (cement)
Color: Cream, tan, and grey with possible mineral staining
Luster: Dull/Earthy

Identified March 15, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (grains), 3-4 (cement); Color: Cream, tan, and grey with possible mineral staining; Luster: Dull/Earthy; Crystal Structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and lithification of sand-sized mineral grains or rock fragments, typically in marine or desert environments. This specimen appears to have undergone cementation by calcite or silica over millions of years.

Uses & applications

Used primarily as a construction material (dimension stone), road aggregate, or 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 vital reservoir rock for groundwater, oil, and natural gas due to its high porosity.

Field identification & locations

Identify in the field by its gritty 'sandpaper' texture and visible mineral grains. It is commonly found in sedimentary basins, canyons, and coastal cliffs. Collectors look for unique banding or fossil inclusions.