sedimentary

Sandstone (Graywacke type)

Clastic Sedimentary Rock (Lithic Sandstone)

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale; Color: Gray to greenish-gray; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.6-2.7. It has a gritty, sandpaper-like texture.

Hardness: 6-7 on Mohs scale
Color: Gray to greenish-gray
Luster: Dull/Earthy

Identified April 14, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the accumulation of sand-sized mineral grains or rock fragments. This specific type likely formed in deep-water marine environments via turbidity currents where rapid deposition prevents the sorting of minerals.

Uses & applications

Commonly used as a building stone, road base material, decorative gravel, and occasionally for grindstones or filtering systems due to its abrasive and porous nature.

Geological facts

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

Field identification & locations

Identify it in the field by its 'sandy' feel when rubbed and its visible crystalline grains. It is extremely common worldwide, particularly in mountain belts and river basins.