sedimentary
Sandstone (lithic wacke/conglomerate mix)
Clastic Sedimentary Rock (SiO2 with lithic fragments)
Hardness: 6-7 (individual grains); Color: Tan, brown, and grey; Luster: Dull/Earthy; Structure: Clastic with visible grains and small rounded pebbles; Cleavage: None.
- Hardness
- 6-7 (individual grains)
- Color
- Tan, brown, and grey
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (individual grains); Color: Tan, brown, and grey; Luster: Dull/Earthy; Structure: Clastic with visible grains and small rounded pebbles; Cleavage: None.
Formation & geological history
Formed by the accumulation and cementation of sand-sized mineral grains or rock fragments in environments like riverbeds, deltas, or beaches over millions of years.
Uses & applications
Commonly used in construction for road base, building stone, and as a decorative landscaping material.
Geological facts
Sandstone makes up about 20% of all sedimentary rocks on Earth. It is a major reservoir for groundwater and petroleum products due to its porosity.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible grains. Often found in areas with ancient sedimentary basins or near modern waterways.
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