sedimentary
Sandstone (Graywacke type)
Clastic Sedimentary Rock (Lithic Sandstone)
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
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Physical properties
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.
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.
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